[c-nsp] IPv6 - PPP-Access

[Christoph Loibl]

Hello,

I am currently trying to get IPv6 via PPPoe/L2tp running in our lab.  
The configuration is as follows:

Cisco878(CPE) <--pppoe--> LAC <--ppp/l2tp--> LNS <--IPv6-->TestHost

LAC is a Cisco7301 12.2(33)SRC1
LNS is a Cisco7301 12.2(33)SRC1

When originanting IPv6 echo-request-packets from the CPE-side towards  
the testhost these packets reach the destination. But all ipv6  
traffic from the testhost to the CPE gets dropped at the LNS and  
counters (RP LES Bad version - whatever this means?) increase:

LNS#show ipv6 cef switching statistics

        Reason                          Drop       Punt  Punt2Host
RP LES Packet destined for us             0         80          0
RP LES Unsupported                        0          2          0
RP LES Bad hop, TTL expired               0          3          0
RP LES Routed to p2p prefix               0          0         40
RP LES MTU exceeded                       0          0          8
RP LES Link-local                         0         30          0
RP LES Bad version                    12246          0          0
RP LES Total                          12246        115         48

All    Total                          12246        115         48
LNS#

When disabling ipv6 cef (no ipv6 cef) ipv6 traffic flow works in both  
directions (CPE<->testhost) and counters stop increasing. At all  
times (regardless of ipv6 cef en-/disabled) IPv6 communication  
directly from the LNS to the CPE works fine.

Any idea if this might be related to CSCsq14261? Unfortunately  
disabling IPv6 CEF is no option here as this breaks 6PE.

Regards

Christoph

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