Cisco | RSP7000 | PA-T3 and PA-2T3 Serial Port Adapters

PA-T3 and PA-2T3 Serial
Port Adapters
Description
The PA-T3 and PA-2T3 serial port adapters are available on Cisco 7200 series routers, on
second-generation Versatile Interface Processor (VIP2) in all Cisco 7500 series routers, and on Cisco
7000 series routers with the 7000 Series Route Switch Processor (RSP7000) and 7000 Series Chassis
Interface (RSP7000CI). These port adapters provide one (PA-T3) or two (PA-2T3) high-speed
full-duplex synchronous serial T3 interfaces and integrated data service unit (DSU) functionality.
The T3 port adapters can transmit and receive data at T3 rates of up to 45 Mbps and use a 75-ohm
coaxial cable available from Cisco to connect to a serial T3 network. These port adapters support the
following features:
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16- and 32-bit cyclic redundancy checks (CRC)
High-speed HDLC data
C-bit, M13, and bypass framing
HDB3 line coding
ATM-DXI, Frame Relay, HDLC, PPP, and SMDS serial encapsulation
DS3 MIB (RFC 1407)
Scrambling and reduced bandwidth
Remote and local loopbacks
Note For additional information on interoperability guidelines for T3 serial port adapter DSUs,
refer to the PA-T3 Serial Port Adapter Installation and Configuration publication.
Platforms
This feature is supported on these platforms:
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Cisco 7200 series
Cisco 7500 series
Cisco 7000 series routers with the RSP7000 and RSP7000CI
PA-T3 and PA-2T3 Serial Port Adapters 1
Configuration Tasks
Configuration Tasks
Perform the tasks in the following sections to configure the PA-T3 (all tasks are optional except for
the first task):
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Configure the PA-T3 Port Adapter
Troubleshoot the PA-T3 Port Adapter
Monitor and Maintain the PA-T3 Port Adapter
For PA-T3 port adapter configuration examples, see the “Configuration Example” section, later in
this chapter.
The PA-T3 supports most interface commands. For information about these commands, refer to the
“Configuring Interfaces” chapter of the Configuration Fundamentals Configuration Guide. For
additional information on how to configure the PA-T3 serial port adapter, refer to the “Configure a
Synchronous Serial Interface” section in the “Configuring Interfaces” chapter of the Configuration
Fundamentals Configuration Guide.
For information on other commands that can be used by the PA-T3 serial port adapter, refer to the
Cisco IOS Release 11.1 configuration guides.
Configure the PA-T3 Port Adapter
In addition to the commands in the “Configure a Synchronous Serial Interface” section in the
“Configuring Interfaces” chapter of the Configuration Fundamentals Configuration Guide, the
commands listed in Table 1 have been added to support the PA-T3 interface configuration. If you do
not modify the configuration of the PA-T3, the configuration defaults shown in Table 1 are used.
Table 1
PA-T3 Port Adapter Defaults
Command
Default Value
cablelength
50
clock source
line
crc 32
16-bit
dsu bandwidth
44736 kbps
dsu mode
0
framing
C-bit
invert data
data is not inverted
scramble
disabled
If you need to change any of the default configuration attributes, complete the first task in global
configuration mode followed by any of the optional tasks in interface configuration mode:
Task
Command
Select the PA-T3 interface and enter interface
configuration mode.
interface serial slot/port-adapter/port (Cisco 7500
series and Cisco 7000 series routers with the
RSP7000 and RSP7000CI)
interface serial slot/port (Cisco 7200 series)
2
Change the cable length.
cablelength length
Enable 32-bit CRC.
crc 32
Change the DSU bandwidth.
dsu bandwidth kbps
Release 11.1 CA
Troubleshoot the PA-T3 Port Adapter
Task
Command
Change the DSU mode. To connect to another
PA-T3 port adapter or a Digital Link DSU, use the
default mode (0). To connect to a Kentrox DSU, use
mode 1. To connect to a Larscom DSU, use mode
2.
dsu mode {0 | 1 | 2}
Change the framing used by the interface.
framing {c-bit | m13 | bypass}
Invert the data stream on the interface.
invert data
Enable scrambling on the interface.
scramble
Troubleshoot the PA-T3 Port Adapter
To set the following loopbacks to troubleshoot the PA-T3 port adapter using Cisco IOS software,
perform the first task beginning in global configuration mode followed by any of the other tasks
depending on your needs:
Task
Command
Loopback after the LIU toward the terminal.
loopback dte
Loopback after going through the framer toward
the terminal.
loopback local
Loopback toward the network before going
through the framer.
loopback network line
Loopback toward the network after going through
the framer.
loopback network payload
Send a FEAC to set the remote framer in
loopback.
loopback remote
These loopback commands loop all packets from the T3 interface either back to the interface or
direct packets from the network back out toward the network.
Monitor and Maintain the PA-T3 Port Adapter
After configuring the new interface, you can display its status. To show current status of the T3
interface on the PA-T3 port adapter, perform any of the following tasks in EXEC mode:
Task
Command
Display system hardware configuration.
show version
Display current interface processors and their
interfaces.
show controllers cbus
Display statistics for the T3 interface.
show interfaces slot/port-adapter/port (Cisco 7500
series and Cisco 7000 series routers with the
RSP7000 and RSP7000CI)
show interfaces slot/port (Cisco 7200 series)
Display the configuration information for the T3
interface.
show controllers serial slot/port-adapter/port
(Cisco 7500 series and Cisco 7000 series routers
with the RSP7000 and RSP7000CI)
show controllers serial slot/port (Cisco 7200
series)
PA-T3 and PA-2T3 Serial Port Adapters 3
Configuration Example
Task
Command
Display protocols configured for the system and
specific interfaces.
show protocols
Display running configuration file.
show running-config
Display configuration stored in NVRAM.
show startup-config
Display specific port adapter information
show diag slot
Configuration Example
The following example shows a typical configuration for serial interface 1/0/0 on a PA-T3 serial port
adapter in a Cisco 7500 series router. The dsu bandwidth command reduces the bandwidth by
padding the T3 frame, and the dsu mode command enables and improves interoperability with other
DSUs.
router# configure terminal
router(config)# interface serial 1/0/0
router(config-if)# ip address 1.1.1.10 255.255.255.0
router(config-if)# clock source internal
router(config-if)# crc 32
router(config-if)# dsu bandwidth 16000
router(config-if)# dsu mode 0
router(config-if)# no scramble
router(config-if)# framing c-bit
router(config-if)# no shutdown
router(config-if)# ^Z
Command Reference
This section documents new or modified commands. All other commands used with this feature are
documented in the Cisco IOS Release 11.1 command references.
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Release 11.1 CA
cablelength
clock source
dsu bandwidth
dsu mode
framing
invert data
loopback
scramble
show controllers cbus
show controllers serial
show diag
show interfaces serial
cablelength
cablelength
To change the length of the cable, use the cablelength interface configuration command. To restore
the default value, use the no form of this command.
cablelength length
no cablelength
Syntax Description
length
Cable length in the range of 0 to 450 feet. The default is 50 feet.
Default
50 feet
Command Mode
Interface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.1 CA.
Example
The following example specifies a cable length of 250 feet:
interface serial 1/0
cablelength 250
PA-T3 and PA-2T3 Serial Port Adapters 5
Command Reference
clock source
To control which clock a T3 interface or a PA-T3 serial port adapter will use to clock its transmitted
data from, use the clock source interface configuration command. To restore the default value, use
the no form of this command.
clock source {internal | line}
no clock source
Syntax Description
internal
Specifies that the interface will clock its transmitted data from
its internal clock.
line
Specifies that the interface will clock its transmitted data from a
clock recovered from the line’s receive data stream (default).
Default
The line’s receive data stream.
Command Mode
Interface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 10.3.
This command was modified in Cisco IOS Release 11.1 CA to include the T3 serial port adapter and
PA-T3 serial port adapter.
This command applies to a Cisco 4000 router or Cisco 7000 series, Cisco 7200 series, and
Cisco 7500 series router. A T3 interface on a PA-T3 serial port adapter can clock its transmitted data
from either its internal clock or from a clock recovered from the line’s receive data stream.
Example
The following example specifies the T3 interface to clock its transmitted data from its internal clock:
interface serial 1/0
clock source internal
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Release 11.1 CA
dsu bandwidth
dsu bandwidth
To specify the maximum allowable bandwidth used by the PA-T3 port adapter, use the dsu
bandwidth interface configuration command. To return to the default bandwidth, use the no form
of this command.
dsu bandwidth kbps
no dsu bandwidth
Syntax Description
kbps
Maximum bandwidth in the range of 22 kbps to 44736 kbps. The
default is 44736 kbps.
Default
44736 kbps
Command Mode
Interface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.1 CA.
The local interface configuration must match the remote interface configuration. For example, if you
reduce the maximum bandwidth to 16000 on the local port, you must also do the same on the remote
port.
The dsu bandwidth command reduces the bandwidth by padding the T3 frame.
To verify the data service unit (DSU) bandwidth configured on the interface, use the show
controllers serial EXEC command.
Example
The following example sets the DSU bandwidth to 16000 kbps on interface 1/0/0:
interface serial 1/0/0
dsu bandwidth 16000
Related Command
show controllers serial
PA-T3 and PA-2T3 Serial Port Adapters 7
Command Reference
dsu mode
To specify the interoperability mode used by the PA-T3 port adapter, use the dsu mode interface
configuration command. To return to the default mode, use the no form of this command.
dsu mode {0 | 1 | 2}
no dsu mode
Syntax Description
0
Sets the interoperability mode to 0. This is the default. Specify mode 0
to connect the PA-T3 port adapter to another PA-T3 port adapter or to a
Digital Link DSU (DL3100).
1
Sets the interoperability mode to 1. Specify mode 1 to connect the
PA-T3 port adapter to a Kentrox DSU.
2
Sets the interoperability mode to 2. Specify mode 2 to connect the
PA-T3 port adapter to a Larscom DSU.
Default
0 mode
Command Mode
Interface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.1 CA.
The local interface configuration must match the remote interface configuration. For example, if you
define the data service unit (DSU) interoperability mode as 1 on the local port, you must also do the
same on the remote port.
You must know what type of DSU is connected to the remote port to determine if it interoperates
with the PA-T3 port adapter. Use mode 0 to connect a PA-T3 port adapter to another PA-T3 port
adapter or to a Digital Link DSU (DL3100). Use mode 1 to connect a PA-T3 port adapter to a
Kentrox DSU. Use mode 2 to connect a PA-T3 port adapter to a Larscom DSU. The dsu mode
command enables and improves interoperability with other DSUs.
To verify the DSU mode configured on the interface, use the show controllers serial EXEC
command.
Example
The following example sets the DSU mode to 1 on interface 1/0/0:
interface serial 1/0/0
dsu mode 1
Related Command
show controllers serial
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Release 11.1 CA
framing
framing
To specify T3 line framing used by the PA-T3 port adapter, use the framing interface configuration
command. To return to the default C-bit framing, use the no form of this command.
framing {c-bit | m13 | bypass}
no framing
Syntax Description
c-bit
Specifies C-bit T3 framing. This is the default.
m13
Specifies m13 T3 framing.
bypass
Specifies bypass T3 framing.
Default
C-bit framing
Command Mode
Interface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.1 CA.
When the framing mode is bypass, the T3 frame data is not included in the T3 frame, just the data.
If you use the bypass option, scrambling must be set to the default (disabled), the dsu mode must be
set to the default (0), and the dsu bandwidth must be set to the default (44736).
To verify the framing mode configured on the interface, use the show controllers serial EXEC
command.
Example
The following example sets the framing mode to bypass on interface 1/0/0:
interface serial 1/0/0
framing bypass
Related Command
show controllers serial
PA-T3 and PA-2T3 Serial Port Adapters 9
Command Reference
invert data
To invert the data stream, use the invert data interface configuration command. This command
applies only to the Cisco 7000 series routers with the RSP7000 and RSP7000CI, Cisco 7200 series
routers, and Cisco 7500 series routers. To disable this feature, use the no form of this command.
invert data
no invert data
Syntax Description
This command has no arguments or keywords.
Default
Data is not inverted.
Command Mode
Interface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.1 CA and Release 11.2 P.
If the interface on the PA-T3 and PA-2T3 synchronous serial port adapters is used to drive a
dedicated T3 line that does not have B8ZS encoding (a method to avoid 15 zeros), the data stream
must be inverted (both TXD and RXD) either in the connecting CSU/DSU or the interface.
By inverting the HDLC data stream, the HDLC zero insertion algorithm becomes a ones insertion
algorithm that satisfies the T3 requirements. Be careful not to invert data both on the interface and
on the CSU/DSU as two data inversions will cancel each other out.
Inverting is a method of avoiding excessive zeroes that is superseded by the use of B8ZS encryption.
This option could be needed for use with legacy equipment that supports this option.
Example
The following example inverts data on serial interface 3/1/0:
interface serial 3/1/0
invert data
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Release 11.1 CA
loopback
loopback
To loop the serial interface on a PA-T3 port adapter, use the loopback interface configuration
command. To remove the loopback, use the no form of this command.
loopback {dte | local | network {line | payload} | remote}
no loopback
Syntax Description
dte
Sets the loopback after the LIU toward the terminal.
local
Sets the loopback after going through the framer toward the
terminal.
network {line | payload}
Sets the loopback toward the network before going through the
framer (line) or after going through the framer (payload).
remote
Sends a far-end alarm control (FEAC) to set the remote framer
in loopback.
Default
Disabled
Command Mode
Interface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.1 CA.
Use this command for troubleshooting purposes.
To verify that a loopback is configured on the interface, use the show interfaces serial EXEC
command.
Example
The following example configures the serial interface located in slot 3/0/0 for a local loopback:
interface serial 3/0/0
loopback local
Related Command
show interfaces serial
PA-T3 and PA-2T3 Serial Port Adapters 11
Command Reference
scramble
To enable scrambling of the payload on the PA-T3 port adapter, use the scramble interface
configuration command. To disable scrambling, use the no form of this command.
scramble
no scramble
Syntax Description
This command has no keywords and arguments.
Default
Scrambling is disabled.
Command Mode
Interface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.1 CA.
T3 scrambling is used to assist clock recovery on the receiving end.
Scrambling can prevent some bit patterns from being mistakenly interpreted as alarms by switches
placed between the DSUs.
The local interface configuration must match the remote interface configuration. For example, if you
enable scrambling on the local port, you must also do the same on the remote port.
To verify that scramble is configured on the interface, use the show controllers serial EXEC
command.
Example
The following example enables scrambling on the PA-T3 port adapter in slot 1, port adapter slot 0,
interface 0:
interface serial 1/0/0
scramble
Related Command
show controllers serial
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Release 11.1 CA
show controllers cbus
show controllers cbus
To display all of the current interface processors and their interfaces, use the show controllers cbus
interface configuration command.
show controllers cbus
Syntax Description
This command has no keywords and arguments.
Command Mode
Interface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.1 CA.
Sample Display
The following is sample output from the show controllers cbus command that shows serial port
1/0/0 on a 1-port T3 serial port adapter installed on a VIP2 in chassis slot 1 and serial port 2/0/0 on
a 1-port E3 serial port adapter installed on a VIP2 in chassis slot 2:
router# show controllers cbus
MEMD at 40000000, 2097152 bytes (unused 672, recarves 1, lost 0)
RawQ 48000100, ReturnQ 48000108, EventQ 48000110
BufhdrQ 48000140 (2822 items), LovltrQ 48000158 (24 items, 2016 bytes)
IpcbufQ 48000168 (40 items, 4096 bytes)
IpcbufQ_classic 48000160 (8 items, 4096 bytes)
3570 buffer headers (48002000 - 4800FF10)
pool0: 10 buffers, 256 bytes, queue 48000148
pool1: 439 buffers, 1536 bytes, queue 48000150
pool2: 223 buffers, 4512 bytes, queue 48000170
pool3: 4 buffers, 4544 bytes, queue 48000178
slot0: VIP2, hw 2.4, sw 21.40, ccb 5800FF20, cmdq 48000080, vps 8192
software loaded from system
IOS (tm) VIP Software (SVIP-DW-M), Experimental Version 11.1(4430)
[gshen 108]
ROM Monitor version 17.0
Ethernet0/0/0, addr 00e0.f7d7.cb00 (bia 00e0.f7d7.cb00)
gfreeq 48000150, lfreeq 48000180 (1536 bytes), throttled 4
rxlo 4, rxhi 261, rxcurr 4, maxrxcurr 4
txq 48001A00, txacc 48001A02 (value 146), txlimit 146
Ethernet0/0/1, addr 00e0.f7d7.cb01 (bia 00e0.f7d7.cb01)
gfreeq 48000150, lfreeq 48000188 (1536 bytes), throttled 0
rxlo 4, rxhi 261, rxcurr 0, maxrxcurr 0
txq 48001A08, txacc 48001A0A (value 0), txlimit 146
Ethernet0/0/2, addr 00e0.f7d7.cb02 (bia 00e0.f7d7.cb02)
gfreeq 48000150, lfreeq 48000190 (1536 bytes), throttled 0
rxlo 4, rxhi 261, rxcurr 0, maxrxcurr 0
txq 48001A10, txacc 48001A12 (value 0), txlimit 146
Ethernet0/0/3, addr 00e0.f7d7.cb03 (bia 00e0.f7d7.cb03)
gfreeq 48000150, lfreeq 48000198 (1536 bytes), throttled 0
rxlo 4, rxhi 261, rxcurr 0, maxrxcurr 0
txq 48001A18, txacc 48001A1A (value 0), txlimit 146
slot1: VIP2, hw 2.4, sw 21.40, ccb 5800FF30, cmdq 48000088, vps 8192
software loaded from system
PA-T3 and PA-2T3 Serial Port Adapters 13
Command Reference
IOS (tm) VIP Software (SVIP-DW-M), Experimental Version 11.1(4430)
[gshen 108]
ROM Monitor version 17.0
Mx T3(1) HW Revision 0x3, FW Revision 2.55
Serial1/0/0, applique is T3 DTE
received clockrate 40557734
gfreeq 48000170, lfreeq 480001A0 (4512 bytes), throttled 248
rxlo 4, rxhi 222, rxcurr 2, maxrxcurr 4
txq 48001A20, txacc 48001A22 (value 111), txlimit 111
slot2: VIP2, hw 2.4, sw 21.40, ccb 5800FF40, cmdq 48000090, vps 8192
software loaded from system
IOS (tm) VIP Software (SVIP-DW-M), Experimental Version 11.1(4430)
[gshen 108]
ROM Monitor version 17.0
Mx E3(1) HW Revision 0x2, FW Revision 2.55
Serial2/0/0, applique is E3 DTE
received clockrate 48333264
gfreeq 48000170, lfreeq 480001A8 (4512 bytes), throttled 0
rxlo 4, rxhi 222, rxcurr 0, maxrxcurr 1
txq 48001A28, txacc 48001A2A (value 111), txlimit 111
slot3: VIP2, hw 2.4, sw 21.40, ccb 5800FF50, cmdq 48000098, vps 8192
software loaded from system
IOS (tm) VIP Software (SVIP-DW-M), Experimental Version 11.1(4430)
[gshen 108]
ROM Monitor version 17.0
Fddi3/0/0, addr 00e0.f7d7.cb60 (bia 00e0.f7d7.cb60)
gfreeq 48000170, lfreeq 480001B0 (4512 bytes), throttled 0
rxlo 4, rxhi 222, rxcurr 0, maxrxcurr 0
txq 48001A30, txacc 48001A32 (value 111), txlimit 111
FastEthernet3/1/0, addr 00e0.f7d7.cb68 (bia 00e0.f7d7.cb68)
gfreeq 48000150, lfreeq 480001B8 (1536 bytes), throttled 0
rxlo 4, rxhi 261, rxcurr 0, maxrxcurr 0
txq 48001A38, txacc 48001A3A (value 0), txlimit 146
Related Command
show controllers serial
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Release 11.1 CA
show controllers serial
show controllers serial
Use the show controllers serial privileged EXEC command to display information that is specific
to the interface hardware.
show controllers serial [slot/port]
show controllers serial [slot/port-adapter/port] (Cisco 7500 series and Cisco 7000 series
routers with the RSP7000 and RSP7000CI)
Syntax Description
slot
(Optional) Slot number of the interface.
port
(Optional) Port number on the interface. The port value is always 0.
port-adapter
(Optional) On Cisco 7500 series routers and Cisco 7000 series routers
with the RSP7000 and RSP7000CI, the location of the port adapter on
a VIP. The value can be 0 or 1.
Command Mode
Privileged EXEC
Usage Guidelines
This command first appeared in Cisco IOS Release 10.0.
This command was modified in Cisco IOS Release 11.1 CA to include sample output for the PA-T3
port adapter.
The information displayed is generally useful for diagnostic tasks performed by technical support
personnel only. For the PA-T3, the show controllers serial command also displays configuration
information such as the framing, clock source, bandwidth limit, whether scrambling is enabled, and
DSU mode configured on the interface. Also displayed are the performance statistics for the current
interval and last 15-minute interval and whether any alarms exist.
Sample Display
The following is sample output from the show controllers serial command that shows serial port
1/0/0 on a 1-port T3 serial port adapter installed on a VIP2 in chassis slot 1:
router# show controllers serial 2/0/1
Serial1/0/0 Mx T3(1) HW Revision 0x3, FW Revision 2.55
Framing is c-bit, Clock Source is Line
Bandwidth limit is 35000, DSU mode 1, Cable length is 50
Data in current interval (325 seconds elapsed):
0 Line Code Violations, 0 P-bit Coding Violation
0 C-bit Coding Violation
0 P-bit Err Secs, 0 P-bit Sev Err Secs
0 Sev Err Framing Secs, 0 Unavailable Secs
0 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs
Total Data (last 24 hours)
0 Line Code Violations, 0 P-bit Coding Violation,
0 C-bit Coding Violation,
0 P-bit Err Secs, 0 P-bit Sev Err Secs,
0 Sev Err Framing Secs, 0 Unavailable Secs,
0 Line Errored Secs, 0 C-bit Errored Secs, 0 C-bit Sev Err Secs
No alarms detected.
PA-T3 and PA-2T3 Serial Port Adapters 15
Command Reference
show diag
To display hardware information for an interface, use the show diag privileged EXEC command on
Cisco 7500 series routers.
show diag [slot]
Syntax Description
slot
(Optional) Slot number of the interface.
Command Mode
Privileged EXEC
Usage Guidelines
This command first appeared in Cisco IOS Release 11.1.
This command was modified in Cisco IOS Release 11.1 CA to include sample output for the PA-T3
port adapter.
Use this command to determine the type of port adapter installed on a VIP2 in your router.
Sample Display
The following is sample output from the show diag command for a one-port T3 serial port adapter
in chassis slot 1:
router# show diag 1
Slot 1:
Physical slot 1, ~physical slot 0xE, logical slot 1, CBus 0
Microcode Status 0x4
Master Enable, LED, WCS Loaded
Board is analyzed
Pending I/O Status: None
EEPROM format version 1
VIP2 controller, HW rev 2.4, board revision D0
Serial number: 04372053 Part number: 73-1684-03
Test history: 0x00
RMA number: 00-00-00
Flags: cisco 7000 board; 7500 compatible
EEPROM contents (hex):
0x20: 01 15 02 04 00 42 B6 55 49 06 94 03 00 00 00 00
0x30: 68 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Slot database information:
Flags: 0x4
Insertion time: 0x14A8 (5d02h ago)
Controller Memory Size: 16 MBytes DRAM, 1024 KBytes SRAM
PA Bay 0 Information:
T3 Serial PA, 1 ports
EEPROM format version 1
HW rev FF.FF, Board revision UNKNOWN
Serial number: 4294967295 Part number: 255-65535-255
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Release 11.1 CA
show interfaces serial
show interfaces serial
To display information about a serial interface, use the show interfaces serial privileged EXEC
command.
show interfaces serial [slot/port] (Cisco 7200 series)
show interfaces serial [slot/port-adapter/port] (Cisco 7500 series and Cisco 7000 series with
the RSP7000 and RSP7000CI)
Syntax Description
slot
(Optional) Slot number of the interface.
port
(Optional) Port number on the interface. The port value is always 0.
port-adapter
(Optional) On Cisco 7500 series routers and Cisco 7000 series routers with
the RSP7000 and RSP7000CI, the location of the port adapter on a VIP.
The value can be 0 or 1.
Command Mode
Privileged EXEC
Usage Guidelines
This command was modified in Cisco IOS Release 11.1 CA to include sample output for the PA-T3
serial port adapter.
For additional command syntax and sample displays, refer to the show interfaces serial command
in the “Interface Commands” chapter of the Configuration Fundamentals Command Reference.
Sample Displays
The following is sample output from the show interfaces serial command for a 1-port T3 serial port
adapter-configured VIP2 in chassis slot 1, in port adapter slot 0.
router# show interface serial 1/0/0
Serial1/0/0 is up, line protocol is up
Hardware is cyBus PODS3 Serial
Internet address is 133.1.1.1/24
MTU 4470 bytes, BW 44736 Kbit, DLY 200 usec, rely 255/255, load 1/255
Encapsulation HDLC, loopback not set, keepalive set (10 sec)
Last input 00:00:05, output 00:00:02, output hang never
Last clearing of “show interface” counters 5d02h
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 27269 drops
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
79039 packets input, 14195344 bytes, 0 no buffer
Received 84506 broadcasts, 0 runts, 0 giants
0 parity
9574 input errors, 6714 CRC, 0 frame, 1 overrun, 0 ignored, 2859 abort
62472 packets output, 13751644 bytes, 0 underruns
0 output errors, 0 applique, 10 interface resets
0 output buffer failures, 0 output buffers swapped out
16 carrier transitions
rxLOS inactive, rxLOF inactive, rxAIS inactive
txAIS inactive, rxRAI inactive, txRAI inactive
PA-T3 and PA-2T3 Serial Port Adapters 17
Command Reference
Table 2 describes significant fields shown in the display.
Table 2
Show Interfaces Serial Field Descriptions
Field
Description
Serial... is {up | down}
...is administratively down
Indicates whether the interface hardware is currently active (whether
carrier detect is present), inactive, or has been taken down by an
administrator.
line protocol
is {up | down}
Indicates whether the software processes that handle the line protocol
consider the line usable (that is, whether keepalives are successful) or
if it has been taken down by an administrator.
Hardware is
Specifies the hardware type.
Internet address is
Specifies the Internet address and subnet mask.
MTU
Maximum Transmission Unit of the interface.
BW
Indicates the value of the bandwidth parameter that has been
configured for the interface (in kilobits per second). The bandwidth
parameter is used to compute IGRP metrics only. If the interface is
attached to a serial line with a line speed that does not match the
default (1536 or 1544 for T1 and 56 for a standard synchronous serial
line), use the bandwidth command to specify the correct line speed
for this serial line.
DLY
Delay of the interface in microseconds.
rely
Reliability of the interface as a fraction of 255 (255/255 is 100%
reliability), calculated as an exponential average over 5 minutes.
load
Load on the interface as a fraction of 255 (255/255 is completely
saturated), calculated as an exponential average over 5 minutes.
Encapsulation
Encapsulation method assigned to interface.
loopback
Indicates whether loopback is set or not.
keepalive
Indicates whether keepalives are set or not.
Last input
Number of hours, minutes, and seconds since the last packet was
successfully received by an interface. Useful for knowing when an
interface failed.
Last output
Number of hours, minutes, and seconds since the last packet was
successfully transmitted by an interface.
output hang
Number of hours, minutes, and seconds (or never) since the interface
was last reset because of a transmission that took too long. When the
number of hours in any of the “last” fields exceeds 24 hours, the
number of days and hours is printed. If that field overflows, asterisks
are printed.
Last clearing of “show interface”
counters
Time the counters were last cleared.
Queueing strategy
First-in, first-out queuing strategy (other queueing strategies you
might see are priority-list, custom-list, and weighted fair).
Output queue, drops
Number of packets in output and input queues. Each number is
followed by a slash, the maximum size of the queue, and the number
of packets dropped due to a full queue.
input queue, drops
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show interfaces serial
Table 2
Show Interfaces Serial Field Descriptions (Continued)
Field
Description
5 minute input rate
Average number of bits and packets transmitted per second in the last
5 minutes.
5 minute output rate
The 5-minute input and output rates should be used only as an
approximation of traffic per second during a given 5-minute period.
These rates are exponentially weighted averages with a time constant
of 5 minutes. A period of four time constants must pass before the
average will be within two percent of the instantaneous rate of a
uniform stream of traffic over that period.
packets input
Total number of error-free packets received by the system.
bytes input
Total number of bytes, including data and MAC encapsulation, in the
error free packets received by the system.
no buffers
Number of received packets discarded because there was no buffer
space in the main system. Compare with ignored count. Broadcast
storms on Ethernets and bursts of noise on serial lines are often
responsible for no input buffer events.
Received... broadcasts
Total number of broadcast or multicast packets received by the
interface.
runts
Number of packets that are discarded because they are smaller than
the medium’s minimum packet size.
giants
Number of packets that are discarded because they exceed the
medium’s maximum packet size.
parity
Number of the parity errors on the interface.
input error
Total number of no buffer, runts, giants, CRCs, frame, overrun,
ignored, and abort counts. Other input-related errors can also
increment the count, so that this sum might not balance with the other
counts.
CRC
Cyclic redundancy checksum generated by the originating station or
far-end device does not match the checksum calculated from the data
received. On a serial link, CRCs usually indicate noise, gain hits, or
other transmission problems on the data link.
frame
Number of packets received incorrectly having a CRC error and a
noninteger number of octets. On a serial line, this is usually the result
of noise or other transmission problems.
overrun
Number of times the serial receiver hardware was unable to hand
received data to a hardware buffer because the input rate exceeded the
receiver’s ability to handle the data.
ignored
Number of received packets ignored by the interface because the
interface hardware ran low on internal buffers. Broadcast storms and
bursts of noise can cause the ignored count to be increased.
abort
Illegal sequence of one bits on a serial interface. This usually indicates
a clocking problem between the serial interface and the data link
equipment.
packets output
Total number of messages transmitted by the system.
bytes output
Total number of bytes, including data and MAC encapsulation,
transmitted by the system.
underruns
Number of times that the transmitter has been running faster than the
router can handle. This might never be reported on some interfaces.
PA-T3 and PA-2T3 Serial Port Adapters 19
Supported MIB
Table 2
Show Interfaces Serial Field Descriptions (Continued)
Field
Description
output errors
Sum of all errors that prevented the final transmission of datagrams
out of the interface being examined. Note that this might not balance
with the sum of the enumerated output errors, as some datagrams
might have more than one error, and others might have errors that do
not fall into any of the specifically tabulated categories.
applique
Indicates an unrecoverable error has occurred on the T3 applique. The
router then invokes an interface reset.
interface resets
Number of times an interface has been completely reset. This can
happen if packets queued for transmission were not sent within several
seconds’ time. On a serial line, this can be caused by a malfunctioning
modem that is not supplying the transmit clock signal, or by a cable
problem. If the system notices that the carrier detect line of a serial
interface is up, but the line protocol is down, it periodically resets the
interface in an effort to restart it. Interface resets can also occur when
an interface is looped back or shut down.
output buffer failures
Number of no resource errors received on the output.
output buffers swapped out
Number of packets swapped to DRAM.
carrier transitions
Number of times the carrier detect signal of a serial interface has
changed state. For example, if data carrier detect (DCD) goes down
and comes up, the carrier transition counter will increment two times.
Indicates modem or line problems if the carrier detect line is changing
state often.
rxLOS, rxLOF, rxAIS
Receive loss of signal, loss of frame, and alarm indication signal
status. Values are inactive or active.
txAIS, rxRAI, txRAI
Transmit alarm indication signal, receive remote alarm indicator, and
transmit remote alarm indicator status. Values are inactive or active.
When the router receives an LOS, LOF, or AIS, the txRAI is active.
When the remote router receives an LOS, LOF, or AIS, the rxRAI is
active.
Supported MIB
The PA-T3 port adapter supports a subset of RFC 1407 MIB.
We support DS3 Near End Group including—DS3/T3 Configuration Table, DS3/T3 Current Table,
DS3/T3 Interval Table, and DS3/T3 Total Table.
We do not support DS3 Far End Group and DS3/T3 Fractional Group.
The PA-T3 port adapter also supports the cardTable in the Cisco Chassis MIB and the MIB-II for
each PA-T3 interface.
What to Do Next
For more information on the PA-T3 serial port adapter, refer to the PA-T3 Serial Port Adapter
Installation and Configuration publication.
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Release 11.1 CA
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