Configuring SRv6 OAM
About SRv6 OAM
SRv6 Operations, Administration, and Maintenance (OAM) detects SRv6 path connectivity and locates SRv6 path problems by using ping and tracert operations based on SRv6 SIDs and SRv6 TE policies.
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SRv6 SID/SRv6 TE policy-based ping —Detects network connectivity and host reachability.
SRv6 SID-based ping and SRv6 TE policy-based ping are H3C proprietary protocols.
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SRv6 SID/SRv6 TE policy-based tracert —Detects network connectivity and locates network problems.
SRv6 OAM protocol extensions
OAM O-flag
As shown in Figure 81 , the O-flag is in the SRH Flags field, indicating that the SRv6 nodes need to
perform OAM processing. The SRv6 nodes process the packets with O-flag set based on the SRH.
In SRv6 OAM, to request all SRv6 nodes on the path to respond to OAM packets, make sure the
O-flag is set for the OAM packets at the source node.
Figure 81 O-flag in SRH Flags field
0 1 2 3
O Reserved
7
End.OP SID
An End.OP SID is an SRv6 SID of OAM type used in SRv6 SID/SRv6 TE policy-based ping/tracert operations. When a device receives a request packet destined for the local End.OP SID, it further checks the SRv6 SID in the packet. If the SRv6 SID is the local SRv6 SID, the device sends a reply; if not, the device discards the packet.
Take SRv6 SID-based ping as an example. As shown in Figure 82 , in order to ping Device C, Device
A constructs an ICMPv6 echo request by adding the End.OP SID of Device C to the SRH header in the request. Upon receiving the request and finding that request is destined for the local End.OP SID,
Device C further checks whether SRv6 SID c is the local SRv6 SID. If it is the local SRv6 SID, Device
C sends an ICMPv6 echo reply; if not, Device C discards the ICMPv6 echo request.
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