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Cisco Bug: CSCuj77052 - IPv6 sessions with ND framed prefix delegation go down post RPFO

Last Modified

Aug 08, 2018

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

5.1.1.BASE 5.2.0.BASE

Description (partial)

Immediately after an RP failover IPv6 PPPoE sessions are brought down by the router and IPv6 traffic stops flowing on the sessions.

This is accompanied by the following error message on the console (where addresses displayed will depend on the router's configuration): 

%ROUTING-RIB-3-ECMP_ERR_ADD : Path add exceed max number of paths supported by protocol. Table 0xXXXXXXXX, prefix XXXX:X:X::/64, protocol subscriber, intf 0xXXXXXXXX, tunnelid 0, nexthop_table 0xXXXXXXXX, nexthop fe80::XXX:XXXX:XXXX:XXX

This issue occurs with IPv6-only or dual stack PPPoE subscriber sessions when the ipv6_rib process is restarted or following an RP failover.

This is observed when "ipv6 nd framed-prefix-pool" is used to delegate the prefix.
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