[c-nsp] GSR 12012 problem with 10720 VPN connection

Joe Shen sj_hznm at yahoo.com.cn
Wed Feb 2 05:44:53 EST 2005


Yes, we do. the MTU of both end is 1500byte.

What makes me confused is why the interface block some
packet sourced from some address while forwarding
others.

disable the tag-switching on GE may make GSR rebuild
the FIB.

thanks



 --- David Barak <thegameiam at yahoo.com> 的正文:
> have you double checked the MTU?  I've seen all
> kinds
> of MTU issues on Cisco P routers
> 
> -David Barak
> 
> --- Joe Shen <sj_hznm at yahoo.com.cn> wrote:
> 
> > Hi,
> > 
> > we met a problem with Cisco GSR 12012 which acts
> as
> > P
> > router in our mpls vpn network.
> > 
> > A 10720 router acts as MPLS-VPN PE which connects
> to
> > GSR 12012 with a GE link. This morning, our
> customer
> > said their router could not learn VPN route. And,
> we
> > found 50% packets lost when we ping the
> problemetic
> > 10720 from an catalyst6509 switch, which connects
> to
> > the core router with two GE links. (vlan 11,
> > vlan22). 
> > Packets from vlan 11 could reach problemetic
> 10720,
> > but vlan 22 could not.
> > 
> > I remove the tag-switching config from the GE
> > configuration on GSR, and re-config it. everything
> > recovered. 
> > 
> > Why? Is there any bug with IOS 12.0(18)ST which
> will
> > cause such a selective packet drop on
> tag-switching
> > interface?  
> > 
> > How could we avoid such problem in future?
> > 
> > thanks 
> > 
> > Joe 
> > 
> >
>
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> =====
> David Barak
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