I have the following setup in place for remote access to an exchange
point in Toronto:
juniper J2320 router
|
cisco bridge 1
|
| ) telco-provided
-------|------- ) layer-2
| ) transport
|
cisco bridge 2
|
exchange point
|
peer router
The telco transport in question is DSL at the top and ethernet at the
bottom. The top bridge is connecting local ethernet to ethernet over
ATM over whatever, so it's a glorified DSL modem; the bottom bridge is
there to clean the traffic that would otherwise flood to the exchange
(e.g. to eliminate other weird, foreign-sourced frames that seem to
appear from the telco layer-2 service from time to time).
For IPv4, this all works gloriously.
For IPv6, not at all.
The bridges are both cisco 2600 devices with "no ip routing". Some
config fragments below. The top bridge has a DSL WIC and I'm bridging
between that and a VLAN configured on an FE port; the bottom bridge
has a pair of FE ports, and I'm bridging between them with no VLANs.
There is a single BVI configured on "cisco bridge 2" just to give me
an address to ssh to. I tried removing that and managing the box via
the console, but no change.
Is there something fundamental I'm missing, here? Why should a
transparent bridge behave differently with IPv4 than it does with IPv6?
Joe
! cisco bridge 1
cisco 2620 (MPC860) processor (revision 0x102) with 61440K/4096K bytes
of memory.
System image file is "flash:c2600-ik9o3s3-mz.123-26.bin"
interface ATM0/0
no ip address
no ip route-cache
no atm ilmi-keepalive
dsl operating-mode auto
!
interface ATM0/0.1 point-to-point
no ip route-cache
bridge-group 1
pvc 0/35
encapsulation aal5snap
!
!
interface FastEthernet0/0.200
encapsulation dot1Q 200
no ip route-cache
bridge-group 1
bridge-group 1 spanning-disabled
!
bridge 1 protocol ieee
! cisco bridge 2
cisco 2621 (MPC860) processor (revision 0x102) with 61440K/4096K bytes
of memory.
System image file is "flash:c2600-ik9o3s3-mz.123-26.bin"
interface FastEthernet0/0
description facing the telco
speed 100
full-duplex
bridge-group 1
bridge-group 1 spanning-disabled
!
interface FastEthernet0/1
description facing the exchange point
bridge-group 1
bridge-group 1 output-pattern-list 1100
bridge-group 1 spanning-disabled
!
interface BVI1
description a way to manage the bridge, v4-only is fine
ip address x.x.x.x y.y.y.y
!
bridge 1 protocol ieee
bridge 1 route ip
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