ipv6 bgp strange effect

Oct 20, 2006 2 Replies
A

Hi



When we set up bgp ipv6 peering on a 7260 npe-g1 with ios 12,3(13) en do a sh bgp neigh xxxx:yyyy::zzzz, we get this output



Sent Rcvd Prefix activity: ---- ---- Prefixes Current: 0 1 Prefixes Total: 1 1 Implicit Withdraw: 1 0 Explicit Withdraw: 0 0 Used as bestpath: n/a 0 Used as multipath: n/a 0



according to my knowledge this would mean that our peering parner doesn't receive/use any prefix of us. But he has us in his routing table, comming from this peering session.



Is this a bug? All of our ipv6 peerings have this strange effect. Everything works without problems, just this problem in the show command



arne


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W

Hi Arne,

Either your ISP or one of its Upstream Providers filter these routes out.

Some ISPs filter out any prefix with a prefix length longer than /24 or class B prefixes with a prefix length longer than /20 or /21.

Hope this helps.

Brad Reese BradReese.Com - Cisco Repair

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Hendersonville Road, Suite 17 Asheville, North Carolina USA 28803 USA & Canada: 877-549-2680 International: 828-277-7272 Fax: 775-254-3558 AIM: R2MGrant BradReese.Com - Cisco Power Supply Headquarters
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A

Hi Brad

I'm the ISP on the one side. I set up IPv6 (not v4) peering. The remote parties are actually receiving AND using our prefix. So everything works fine, only the ouput of the sh bgp command seems "different from reality"

arne

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