[c-nsp] Mpls on fastethernet <-> atm route-bridge ip link?

[Oliver Boehmer (oboehmer)]

Sean,

I don't think we support running MPLS/LDP over an RBE link. We can
terminate RBE links in a VRF just fine (so we will switch tag2ip or
ip2tag), but I don't expect "tag-switching ip" to work. I'm not an RBE
geek, but we might also have problems with the increased MPLS MTU, not
sure..

	oli

Sean Watkins <> wrote on Wednesday, February 08, 2006 7:21 PM:

> Hi,
> 
> Anyone ever setup mpls on a fastethernet <-> atm route-bridge ip link?
> 
> Ie, one side
> 
> interface FastEthernet5/0
>  bandwidth 100000
>  ip address X.110 255.255.255.252
>  load-interval 30
>  duplex full
>  tag-switching mtu 1508
>  tag-switching ip
> 
> 
> .
> ...
> Service providers ATM network
> ...
> ..
> 
> to
> 
> interface ATM3/0.80 point-to-point
>  bandwidth 100000
>  ip address X.109 255.255.255.252
>  ip pim sparse-dense-mode
>  atm route-bridged ip
>  tag-switching mtu 1508
>  pvc 80/50
>   tx-ring-limit 3
> 
> 
> 
> TDP brings the link up, and I can see lables on both sides, but there
> appears to be a MTU issue as web pages die when the switching begins.
> 
> I verified the link can do 1500 bytes, with an extended ping with DF
> set 
> 
> 
> Rtr#ping X.110 df-bit source atm3/0.80 size 1500
> 
> Type escape sequence to abort.
> Sending 5, 1500-byte ICMP Echos to X.110, timeout is 2 seconds:
> Packet sent with a source address of X.109
> Packet sent with the DF bit set
> !!!!!
> Success rate is 100 percent (5/5), round-trip min/avg/max = 40/40/44
> ms Rtr#
> 
> Pinging anything bigger, dies:
> 
> Rtr#ping X.110 df-bit source atm3/0.80 size 1502
> 
> Type escape sequence to abort.
> Sending 5, 1502-byte ICMP Echos to X.110, timeout is 2 seconds:
> Packet sent with a source address of X.109
> Packet sent with the DF bit set
> .....
> Success rate is 0 percent (0/5)
> 
> 
> I'm trying to verify with the service provider that they support jumbo
> frames - but are there any known issues using MPLS on a link such as
> the above? In testing regular fast ethernet ports, the same ping
> fails after 1500.
> 
> The service providers fastethernet port is attached to a
> Newbridge/Alcatel 36170 - anyone have any experiencing using jumbo
> frames on that gear? 
> 
> 
> 
> 
> Sean
> 
> 
> 
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