Question

cisco 878 bridge shdsl to ethenet

Asked by: meverest

Hi all,

I have a cisco 878 - 4 ethernet ports, 1 BRI, 1 g.shdsl

I want to bridge the shdsl port to the ethernet so I can set up a PPPoE from another router interface connected to an ethernet port on the 878.  Essentially, I want a bridged modem kind of configuration.

Now, I'm no cisco expert, but I've used IOS a few times and so I only know just a bit to get around the shell.

I'm trying to do something like this:

bridge 1 protocol ieee
bridge irb
!
interface BVI1
 ip address 172.16.0.6 255.255.255.252
!
controller DSL 0
 mode atm
 line-term cpe
 line-mode 2-wire line-zero
 line-rate auto
!
interface atm0
 no shut
 no ip address
 no ip directed-broadcast
 no atm ilmi-keepalive
 pvc 8/35
  encapsulation aal5snap
 !
 bridge-group 1
!
interface vlan1
 no shut
 ip address 172.16.0.2 255.255.255.252
 bridge-group 1
!

problem is, though, as soon as I add the vlan1 to the bridge group, I lose connection to the router on the vlan address (well, ok I understand that) but no connectivity to the BVI1 address either.  I have both the other ends configured on the PC (172.16.0.1/30 and 172.16.0.5/30)

any ideas what I am doing wrong and what I need to do to make this work?

Thanks!

Regards,  Mike.

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Asked On
2009-02-02 at 05:06:10ID24104450
Tags

cisco 878 bridge shdsl ethenet pppoe

Topics

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Answers

 

by: donjohnstonPosted on 2009-02-02 at 05:24:19ID: 23526626

The BVI and VLAN1 interface are both in bridge-group 1 yet there IP addresses are not on the same network.


 

by: meverestPosted on 2009-02-02 at 05:37:07ID: 23526725

Hi Don,

thanks for your response.

>> The BVI and VLAN1 interface are both in bridge-group 1 yet there IP addresses are not on the same network.

is there some reason why the addresses should be on the same network?  I can't think why this would cause any probs.

In any case, if I do not put any address on the bridge interface, I still lose IP access to the device.

I have not yet tried removing the address from vlan and keeping the BRI1 address.  Do you reckon that might be different somehow?

Regards,  Mike.

 

by: donjohnstonPosted on 2009-02-02 at 06:03:07ID: 23526923

>is there some reason why the addresses should be on the same network?  I can't think why this would cause any probs.

A bridge-group is a broadcast domain. Every device in a broadcast domain must have IP addresses consistent with other devices in that broadcast domain. Or put another way, if you have two devices connected to a plain old layer two switch. Would there be any problem if one had an IP address of 172.16.1.2 and the other had 10.1.1.1?

 

by: meverestPosted on 2009-02-02 at 14:19:14ID: 23532105

OK,

that makes some sense, but I can confirm that I get the same effect like this:

bridge 1 protocol ieee
bridge irb
!
interface BVI1
 ip address 172.16.0.2 255.255.255.252
!
controller DSL 0
 mode atm
 line-term cpe
 line-mode 2-wire line-zero
 line-rate auto
!
interface atm0
 no shut
 no ip address
 no ip directed-broadcast
 no atm ilmi-keepalive
 pvc 8/35
  encapsulation aal5snap
 !
 bridge-group 1
!
interface vlan1
 no shut
 bridge-group 1
!

gotta be something I'm doing bad with the bridge perhaps?

Cheers.

 

by: meverestPosted on 2009-02-02 at 22:25:24ID: 23534497

OK, the issue was enable ip protocol on the bridge interface, so something like:

bridge 1 protocol ieee
bridge irb
bridge 1 ip routing

did the trick.

Just for the record, there is no problem with the addresses.  Having different subnets on the vlan and then on the bridge made no difference - i.e. it still works with both addresses applied.

thanks for the suggestions though.

Cheers!

20120131-EE-VQP-002

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