Sure. See attached. It's from a bastardised lab and to be honest, I have seen this in multiple scenarios on the same routers, in different labs, so I am suspecting a bug of some kind.
All 3 routers are running 12.2(31)SB11 SP train. I haven't tried an alternative IOS yet. --Dan > -----Original Message----- > From: Rick Mur [mailto:[email protected]] > Sent: 10 November 2009 20:21 > To: Daniel Holme > Cc: [email protected] > Subject: Re: [OSL | CCIE_SP] Cell-mode ATM label stack > > Would you share your configuration on the 2 routers? It may get easier > to debug. > All seems fine and labels/vc's are allocated. Have you tried reloading > the routers? > > > > -- > Regards, > > Rick Mur > CCIE2 #21946 (R&S / Service Provider) > Sr. Support Engineer - IPexpert, Inc. > URL: http://www.IPexpert.com > > On 10 nov 2009, at 18:57, Daniel Holme wrote: > > > Hi > > > > R9 -- ATM1 -- R1 > > (both links are cell-mode MPLS) > > > > I've got a weird problem in the lab where I can see LSP created > > across the ATM links and I can ping R1 loopback to R9 loopback no > > problems, and beyond, all labelled through LDP/OSPF. I can see the > > bindings are correct for this in ATM1 and the VCI/VPI looks okay too: > > > > Rack1R9(config-vrf)#do sh mpls for 44.44.44.1 > > Local Outgoing Prefix Bytes Label Outgoing Next > > Hop > > Label Label or VC or Tunnel Id Switched interface > > 18 1/33 44.44.44.1/32 0 AT3/0.1 > > point2point > > > > CellModeATM#sh mpls atm-ldp binding 44.44.44.1 32 > > Destination: 44.44.44.1/32 > > Headend Router ATM1/0.1 (1 hop) 1/33 Active, VCD=60 > > Tailend Router ATM3/0.1 1/33 Active, VCD=102 > > > > The problem is when I try to add a label to the stack. If I > > provision a VPN in BGP and create loopbacks in this VPN on R1 and R9 > > and ping between them with no joy. > > > > When I come to debug I see weird label values in the FIB: > > > > Rack1R1#sh ip cef vrf VPN_A 10.44.9.9 det > > 10.44.9.9/32, epoch 0 > > recursive via 44.44.44.9 label 31 > > nexthop 150.1.101.254 ATM3/0.1 label 65569 > > > > Rack1R9#sh ip cef vrf VPN_A 100.100.100.1 det > > 100.100.100.1/32, epoch 0 > > recursive via 44.44.44.1 label 31 > > nexthop 150.1.109.254 ATM3/0.1 label 65569 > > > > Do they actually mean anything? > > > > Looking at the packets, you do not see the ATM VC in the label value > > in the packet header (because there is no mechanism to put the > > values in there), therefore you can not see if there is a problem > > there: > > > > (ATM1) > > 19:44:06: MPLS turbo: AT3/0.1: rx: Len 112 Stack {0 0 255} {31 0 > > 255} - ipv4 data > > 19:44:06: MPLS turbo: AT1/0.1: tx: Len 112 Stack {0 0 254} {31 0 > > 255} - ipv4 data > > > > On the other end, I see the MPLS packet come in (again with a > > zero'ed label) but then I do not see the IP packet materialise in a > > 'debug ip packet'... > > > > (R1) > > 19:45:39: MPLS turbo: AT3/0.1: rx: Len 112 Stack {0 0 254} {31 0 > > 255} - ipv4 data > > > > Normally in a frame-mode environment I would be able to trace the > > label stacking and look at the stack change as the packets flow > > through the network. I can't really do that here, other than see > > that the VPN label does appear to remain. It looks like cell-mode > > devices do not perform PHP? > > > > debug mpls atm-ldp X does not really produce anything helpful. > > > > It's almost like the routers are receiving the labelled packets (w/ > > stack) over the ATM interfaces and the not doing anything further > > with them. However a single label on the packet is okay. > > > > Any suggestions on how to troubleshoot this further... > > > > > > (Oh, and congrats Brian Bartik). > > > > > > -- > > Dan Holme > > > > > > > > > > This email has been scanned for all viruses. > > > > Please consider the environment before printing this email. > > > > The content of this email and any attachment is private and may be > > privileged. If you are not the intended recipient, any use, > > disclosure, copying or forwarding of this email and/or its > > attachments is unauthorised. 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cellmodeatm
Description: cellmodeatm
r1
Description: r1
r9
Description: r9
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