From: gladston@br.ibm.com
Date: Tue Aug 02 2005 - 21:39:37 GMT-3
Thanks for the reply,
No, it is not solved.
I configured another router (no spoke or hub here) to see if the problem
was related to NBMA, but the problem is still occurring.
I removed all 'aditional' features, leave only a single IPv6 address, and
it did not change.
These are the scenarios where the problem is happening:
1.
BB---R5 (hub)-s0/0-------------------R2
|_________R3
Pinging from R2 to R3 or from R3 to R2 starts the problem.
or
Pinging from BB to R2 or to R3 also starts the problem.
2.
R5-s0/0-------(s0/0.235)-R2-(e0/0.26)--------R6
Pinging from R5 to R6 starts the problem.
show ipv6 route shows that there is only one route to the destination.
Cordially,
------------------------------------------------------------------
Gladston
"Scott Morris" <swm@emanon.com>
02/08/2005 21:21
Please respond to
<swm@emanon.com>
To
Alaerte Gladston Vidali/Brazil/IBM@IBMBR, <ccielab@groupstudy.com>
cc
Subject
RE: Re: RE: Failing Ping from Spoke to Spoke
Do you have a misconfiguration there? Normal route-caching works on
flows.
So one flow (similar src/dst) will go the same direction all the time. CEF
pre-processes L2 next hop information so that you have ALL the info there
all the time, which makes a balancing situation take place.
So if you have misconfigured something (remember, there aren't secondary
addresses per se with IPv6, but you can have multiple "ipv6 address"
commands) So if you put one in the wrong place and thought you were
overwriting it like we do with the "ip address" command (there can be only
one primary) then you have a multiple route concept happening. Multiple
next hops would lead the router to assume multi-path operation. Only one
works, the other doesn't. Hence your skipping there.
I'm late to the conversation, so forgive me if this has been hashed out
already. But I'd do a quick "wr t" and look for extra addresses (that's
"show run" in old-guy speak!)
:)
Scott
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
gladston@br.ibm.com
Sent: Tuesday, August 02, 2005 3:36 PM
To: ccielab@groupstudy.com
Subject: Re: Re: RE: Failing Ping from Spoke to Spoke
Hi,
Disabling IPv6 CEF makes the problem disappear:
Rack2R2(config-subif)#no ipv cef
Rack2R2(config)#do sh ipv6 cef
%IPv6 CEF not running
Rack2R2(config)# ipv cef
Rack2R5#pi 2001:148:5:6::1
!!!!!
Rack2R2(config-subif)#ipv cef
Rack2R5#pi 2001:148:5:6::1
!.!.!
Success rate is 60 percent (3/5), round-trip min/avg/max = 8/9/12 ms
Strange, isn't it?
The test above is from another configuration that I did just to check if
the
problem was or not related to Hub/Spoke. This is the topology:
R5-----(s0/0.235)-R2-(e0/0.26)-----R6
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