From: Chris Lewis (chrlewiscsco@gmail.com)
Date: Wed May 24 2006 - 13:01:38 ART
Your example looks to configure fallback bridging correctly, but you should
not expect the pings to be successful for two counts. First R3 and R6 would
not know how to reply to the ping as they would not have a routing table
entry for the source IP address of the other. Second, fallback bridging is
for non IP protocols. Fallback bridging forwards traffic that the switch
does not route and forwards traffic belonging to a nonroutable protocol such
as DECnet.
Your example is using Ip traffic, so fallback bridging does not apply. Try
the communication with a non IP protocol.
Chris
On 5/24/06, Larry Chuon <lchuon@gmail.com> wrote:
>
> Hi group,
>
> I'm trying to follow an old thread at
> http://www.groupstudy.com/archives/ccielab/200509/msg00325.html and
> reading
>
>
http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12225see/scg/swfall
> bk.htm#
>
> But I'm still a bit confused. Lets say I have the following
> configuration:
>
> R6
> |.6
> | (vlan 67)
> |.7
> s1
> |fa0/3
> |
> R3
>
> bridge 1 prot vlan-bridge
> !
> int vlan67
> ip add 155.1.67.7 255.255.255.0
> bridge 1
> !
> int f0/3
> no switch
> ip add 255.1.37.7 255.255.255.0
> bridge 1
>
> There is no routing protocol running between R3 and R6. After enabled
> fallback bridging, am I supposed to be able to ping from R3 to R6 and vice
> versa? I must have done something wrong. It's not working for me.
>
> sw1(config-if)#do sh bridge 1
> Br Group Mac Address State Type Ports
> -------- ----------- ----- ---- -----
> 1 000a.8af6.ee8d Forward DYNAMIC Vl67 Fa0/13
> 1 0017.0eaf.a8f8 Forward DYNAMIC Fa0/6
> 1 0017.5902.9b20 Forward DYNAMIC Vl67 Fa0/3
>
> Please help.
>
> Larry
>
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