[cisco-bba] ATM and Ethernet Question

Tue Apr 22 19:48:46 EDT 2008

Thanks for everyone's help. I got this to work thanks to Robert and
Cisco TAC. 

It was exactly what Robert had suggested and that was to remove the "atm
route-bridged ip" under the ATM config. I swear I tried this! 

Cisco TAC then suggested I remove all config pertaining to the
bridging/roruting of any layer 3 protocols to keep everything purely at
layer 2 which was what I wanted. And so I was advised to remove "bridge
irb" and "bridge 2 route ip" from my original config. Still wasn't
working.

Cisco TAC then came back and said I needed to have "bridge crb" in the
config. I put that in and wham it started working and I got layer 2 all
the way from the customer site through the ATM cloud and onto VLAN 903
and back to our data centre. I think removing the "bridge irb" and
putting it back in as "bridge crb" helped...not sure how...but it did..

I then changed it from "bridge crb" to "bridge irb" and this continued
to work. I even put "bridge 2 route ip" back in and it was still
working. I then put ""atm route-bridged ip" back in under the ATM and it
stopped working :)

Here's my network diagram again and config for those interested. I've
left the config purely at layer 2 with no bridging/routing of layer 3
protocols.

Data Centre VLAN 903 (192.16.14.1) -> [Switched Network (Ethernet)] ->
core-router (ATM/Ethernet sub-interface) -> [ATM cloud] -> Customer Site
(192.168.14.2)

bridge irb
!
bridge 2 protocol ieee
!
interface ATM1/0.304470 point-to-point
 description ATM VC
 bandwidth 2048
 bridge-group 2
 pvc 10/100
  ubr 2048
  encapsulation aal5snap
!
interface GigabitEthernet0/0.903
 description VLAN 903
 encapsulation dot1Q 903
 ip flow ingress
 bridge-group 2

Cheers.

Andy

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Today's Topics:

   1. Re: ATM and Ethernet Question (Andy Saykao)

----------------------------------------------------------------------

Message: 1
Date: Tue, 22 Apr 2008 12:31:46 +1000
From: "Andy Saykao" <andy.saykao at staff.netspace.net.au>
Subject: Re: [cisco-bba] ATM and Ethernet Question
To: "Robert Blayzor" <rblayzor.bulk at inoc.net>
Cc: cisco-bba at puck.nether.net
Message-ID:

<56F211C5E3F24F47B103EA1B253822BE02BF4860 at vic-cr-ex1.staff.netspace.net.
au>

Content-Type: text/plain;	charset="US-ASCII"

Hi Robert,

Wasn't sure exactly which bit to remove so I tried removing the "atm
route-bridged ip" first from the config but still no Layer 2 between
both end points. I then put it back in and then removed "encapsulation
aal5snap". And lastly I removed both lines from the config. No joy with
any of these combinations.

I saw this Cisco article about using Layer 2 Local Switching
(Configuring ATM-to-Ethernet VLAN Mode Local Switching) at:

http://www.cisco.com/en/US/docs/ios/12_0s/feature/guide/fslocal.html#wp1
110021

Our router is a 7301 and it appears I need to downgrade the IOS on our
router (using 12.3(24)) to a 12.2 release as advised by Cisco's Feauture
Navigator tool - no really sure if this is a good idea.

Thanks for your help.

Cheers.

Andy

-----Original Message-----
From: Robert Blayzor [mailto:rblayzor.bulk at inoc.net]
Sent: Monday, 21 April 2008 9:54 PM
To: Andy Saykao
Cc: cisco-bba at puck.nether.net
Subject: Re: [cisco-bba] ATM and Ethernet Question

On Apr 21, 2008, at 1:09 AM, Andy Saykao wrote:
> bridge irb
> bridge 2 protocol ieee
> bridge 2 route ip
> !
> interface ATM1/0.304470 point-to-point  description ATM VC  bandwidth
> 2048  atm route-bridged ip  bridge-group 2  pvc 10/100
>   ubr 2048
>   encapsulation aal5snap
> !
>

I believe you need to remove the route-bridged encapsulation.

--
Robert Blayzor, BOFH
INOC, LLC
rblayzor at inoc.net
http://www.inoc.net/~rblayzor/

Mac OS X. Because making Unix user-friendly is easier than debugging
Windows.

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