[c-nsp] 2600 to 2600 via t1 config question

[Bruce Pinsky]

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Jeff Crowe wrote:
> Hi all,
> 
> I am trying to configure bridging via t1 on two cisco 2600's sitting back to
> back.  Here is a brief outline of what I am trying to accomplish:
> 
> Router A: 
> FE 0/0: 1.2.3.4/24 (publicly routable)
> S0/0: encapsulation frame relay
> S0/0.1 ptp: 172.20.0.1/30 dlci 100 
> S0/0.2 ptp: 5.6.7.8/30 (peering address) dlci 101 bridge-group 2
> 

Does it have to be frame relay?  What you need here is PPP Half-bridging.

http://www.cisco.com/en/US/tech/tk713/tk507/technologies_configuration_example09186a0080093c80.shtml

Your other choice would be to use Integrated Routing and Bridging.

http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_configuration_guide_chapter09186a00800ca767.html#wp1041949

> Router B:
> FE 0/0: no ip - bridged ethernet connection - bridge-group 2
> S0/0: encapsulation frame relay
> S0/0.1 ptp: 172.20.0.2/30 dlci 100 bridge-group 1
> S0/0.2 ptp: unnumbered - bridged to ethernet bridge-group 2
> 

You need to disable IP routing here because IOS does not bridge IP just
because no IP addresses are applied to an interface.

> PC: 
> ETH: 5.6.7.9/30 connected to Router B FE 0/0.
> 
> 
> My serial and sub interfaces come up.  I am able to ping from Router A to
> 172.20.0.2, and ping from Router B to 172.20.0.1.  I cannot however ping
> from the PC at 5.6.7.9 to Router A 5.6.7.8.
> 
> I can see the routes being installed in router A for both interfaces (0.1
> and 0.2).
> 
> Can someone tell me what step I am missing to forward the packets on Router
> B from the FE 0/0 interface and have them go across S0/0.2 to hit Router A
> on S0/0.2?
> 
> 
> Here are the relevant configs:
> 
> Router A config:
> 
> hostname RouterA
> !
> ip cef
> !
> frame-relay switching
> !
> interface FastEthernet0/0
>  ip address 1.2.3.4 255.255.255.0
>  duplex auto
>  speed auto
>  bridge-group 1
> !
> interface Serial0/0
>  no ip address
>  encapsulation frame-relay IETF
>  no fair-queue
>  bridge-group 1
> !
> interface Serial0/0.1 point-to-point
>  ip address 172.20.0.1 255.255.255.252
>  frame-relay interface-dlci 100
>  bridge-group 1
> !
> interface Serial0/0.2 point-to-point
>  ip address 5.6.7.8 255.255.255.252
>  frame-relay interface-dlci 101
> !
> bridge 1 protocol ieee
> bridge 2 protocol ieee
> 
> ################################
> 
> Router B config:
> 
> hostname RouterB
> !
> frame-relay switching
> !
> interface Ethernet0/0
>  no ip address
>  bridge-group 2
> !
> interface Serial0/0
>  no ip address
>  encapsulation frame-relay IETF
>  no fair-queue
>  frame-relay intf-type dce
>  bridge-group 1
> !
> interface Serial0/0.1 point-to-point
>  ip address 172.20.0.2 255.255.255.252
>  frame-relay interface-dlci 100
>  bridge-group 1
> !
> interface Serial0/0.2 point-to-point
>  frame-relay interface-dlci 101
>  bridge-group 2
> !
> bridge 1 protocol ieee
> bridge 2 protocol ieee
> 
> ################################
> 
> PC is set to 5.6.7.9/30.
> 
> 
> 
> Thanks,
> 
> Jeff
> 
> 
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bep

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