Troubleshooting Ipv6 Connectivity Loss - Avaya 8800 Troubleshooting Manual

Upper layer troubleshooting

Troubleshooting IPv6 connectivity loss

If the switch experiences loss of IPv6 connectivity, use the following procedure to troubleshoot
the issue.
1. Through CLI or ACLI commands, make sure the required routes are in place and
2. INCOMPLETE neighbor state indicates a problem if the corresponding neighbor is
3. If the corresponding route is not in place then this is a routing issue. If the neighbor
4. Disabling and re-enabling IPv6 on the VLAN often recovers connectivity.
5. Display the RSMLT and MLT status:
6. If the CLI or ACLI output does not indicate any problems, tracing all packets at the
450 Troubleshooting
the corresponding neighbor entries are resolved (that is, in REACHABLE, PROBE,
DELAY or STALE state).
used by some of the IPv6 routes. This applies to neighbor entries with link-local
addresses. (Note that global addresses are not normally used as next hops; having
a global IPv6 neighbor entry as INCOMPLETE does not usually lead to a
connectivity issue).
is not present or is INCOMPLETE, then further debugging is needed on the network
level (that is, the state of other nodes needs to be examined).
show ip rsmlt info show mltinfo (CLI)
show ip rsmlt show mlt (ACLI)
Make sure the RSMLT peer MAC is learned and the IST state is ist .
RSP level can sometimes provide additional insight:
con rsp-trace ingress-pkt-trace port 3/17 state ena interval
10
con rsp-trace ingress-pkt-trace port 3/17 state dis dump rsp-
trace ingress-pkt-trace port 3/17 (CLI)
OR
rsp-trace ingress-pkt-trace 3/17 enable 10
no rsp-trace ingress-pkt-trace 3/17 dis
dump rsp-trace ingress-pkt-trace 3/17 (ACLI Global Configuration
Mode)
=========================================================================
======= RspPacket Trace
=========================================================================
======= PKT SRC DST DSTMAC SRCMAC SRCIP DSTIP EGQID ERROR ID PHYPORT PORT
ORMGID CONDITION
Comments? infodev@avaya.com
July 2013