[c-nsp] L2 MPLS VPNs

[Cisco List]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Be forewarned, we've seen some nasty issues with CEF and dCEF on 75xx
with 12.2(25)S1 and have backed up to 12.2(18)S6 as a result.  We're
doing L2 MPLS, L3 MPLS, OSPF, & BGP with a variety of different
modules including VIP2-50, VIP4-80, PA-MC-2T3, PA-A3-OC3, PA-2T3+,
PA-OC12-SRP.  We found that for a lot of T1 connected customers,
traffic in one direction was being process switched while in the
other direction it was being dCEF switched.  This resulted in VERY
strange behavior rather than the typical, CEF barfed, behavior.  In
one case traffic appeared to be getting blocked for certain protocols
and ports, rather than certain source/destination pairs failing. 
Turning dCEF off fixed that issue but caused major issues with any
PPP connected circuits with MLPPP being the most severely affected.
After a few RSP lockups and cold boots we backed up in IOS version. 
Backing up to 12.2(18)S6 fixed everything that was going wrong and is
working well so far.

So, basically be careful with 12.2(25)S.  We have a TAC case open now
to investigate and suspect that Bug IDs will be assigned shortly.

Regards,
Chad

- ----------------------------
Chad E Skidmore
One Eighty Networks, Inc.
http://www.go180.net
509-688-8180   

- -----Original Message-----
From: Bruce Pinsky [mailto:bep at whack.org] 
Posted At: Thursday, December 02, 2004 8:05 AM
Posted To: Cisco List
Conversation: [c-nsp] L2 MPLS VPNs
Subject: Re: [c-nsp] L2 MPLS VPNs


- -----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

M.Palis wrote:
| Problem description:
|
| We are trying to test Layer 2 MPLS VPNs using Cisco AToM. We are 
| trying to implement ATM overs MPLS using a cisco 7507 router
| (rsp-k91pv-mz.122-14.S7) and the following ATM card :
| PA Bay 0 Information:
| ENHANCED ATM OC3 SMI PA, 1 ports
| EEPROM format version 1
| HW rev 2.00, Board revision A0
|
| When we try to apply the mpls l2 commands under the ATM pvc the 
| command line does nor give us the option for mpls l2transport ....:
| l(config-subif)#pvc 1/70 l2
| l(config-subif)#pvc 1/70 l2transport
| l(cfg-if-atm-l2trans-pvc)#?
| ATM L2transport VC configuration commands:
| default Set a command to its defaults
| encapsulation Select ATM Encapsulation for VC exit Exit from ATM 
| L2transport VC Configuration Mode no Negate a command or set its 
| defaults ubr Configure Unspecified Bit Rate (UBR) for this interface 
| vbr-nrt Enter Variable Bit Rate (pcr)(scr)(bcs)
|
|
| We tried the same configuration on another 7507 with the same IOS on 
| an ATM
| E3 card and the command line works ok.
| interface ATM4/0/0.4 point-to-point
| pvc 1/47
| vbr-nrt 2048 2048
| encapsulation aal5
| mpls l2transport route x.x.x.x
| Are there any limitations with the ATM cards and l2 VPNs?
|


According to Feature Navigator on cisco.com, AToM for ATM AAL5 isn't
supported on the 7500 until 12.2(25)S1.


- - --
=========
bep

- -----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.2 (MingW32)

iD8DBQFBrz1JE1XcgMgrtyYRAmFwAKCuEifI5Fw67am7FzNN2w6loLYmxQCfezSh
im6qSzGqS/gGpn0qVH/nti4=
=wDx0
- -----END PGP SIGNATURE-----
_______________________________________________
cisco-nsp mailing list  cisco-nsp at puck.nether.net
https://puck.nether.net/mailman/listinfo/cisco-nsp
archive at http://puck.nether.net/pipermail/cisco-nsp/


-----BEGIN PGP SIGNATURE-----
Version: PGP 8.1

iQA/AwUBQa9GcU2RUJ5udBnvEQJ3cQCgg9me0Inj0O/kIQN+kGuMQNUzR3wAoP0B
LKDGxzfGKpFaDIuN1uoChNAV
=rfhO
-----END PGP SIGNATURE-----