WAN BGP/OSPF/IPv6 Tunnel (Uniform 80% Packet Loss)
I've been racking my brain for two days now, searching Cisco documentation, my CCNP study materials and performing various web searches and I've yet to find a cause for this odd issue.
I work for a Internet Service Provider and for testing purposes while we wait for native IPv6 backbone connectivity I've been setting up IPv6 via OSPF on our core network with a /32 we've been assigned by ARIN and testing external connectivity through a ipv6ip tunnel with Sprint set up on our Sprint backbone router. We have a BGP peering session running over the tunnel with Sprint.
We are experiencing uniform packet loss (80 percent) when pinging from routers routing through the backbone router over the tunnel to the IPv6 internet. However, when we ping from the backbone router through the tunnel to the IPv6 internet we experience no packet loss. Furthermore we can ping from our routers to the backbone router tunnel address just fine.
The backbone router is a Cisco 12K running GRP-B management and the adjacent routers/switches are Cisco 6509s running Sup720 supervisor cards.
Here is some ping examples:
The backbone router can ping ipv6.google.com just fine through the tunnel, which means the tunnel and BGP is running fine.
router.backbone.metroix#ping ipv6 ipv6.google.com
Translating "ipv6.google.com"...domain server (220.127.116.11) [OK]
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2001:4860:B004::68, timeout is 2 seconds:
Success rate is 100 percent (5/5), round-trip min/avg/max = 220/221/224 ms
We can ping from a adjacent router to the backbone router's local tunnel address fine:
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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