From: Brian McGahan (brian@xxxxxxxxxxxxxxx)
Date: Tue Mar 05 2002 - 13:15:46 GMT-3
Anand,
This is a common issue that causes people to tear their hair out. SR/TLB
can only be done with non-routable protocols. This document explains why.
http://www.cisco.com/warp/customer/701/4.html
"Remember that Ethernet and Token Ring bridging is only possible with
non-routable protocols. Here's why:
Sometimes MAC addresses are carried in the data portion of a frame. For
instance, Address Resolution Protocol (ARP) places the hardware address in
the data portion of the the link-layer frame. It is simple to convert source
and destination addresses in the header, but conversion of hardware
addresses that may appear in the data portion is more difficult. When
performing source route transparent or source route translational bridging
between Ethernet and Token Ring, Cisco does not search for instances of
hardware addresses in the data portion. So, only non-routable protocols work
with Ethernet and Token Ring bridging."
HTH
Brian McGahan
CCIE #8593
brian@cyscoexpert.com
CyscoExpert Corporation
Internetwork Consulting & Training
http://www.cyscoexpert.com
Voice: 847.674.3392
Fax: 847.674.2625
----- Original Message -----
From: "Chua, Parry" <Parry.Chua@compaq.com>
To: "Anand Ghody" <vze2hq65@verizon.net>; <ccielab@groupstudy.com>
Sent: Tuesday, March 05, 2002 3:59 AM
Subject: RE: translational bridging driving be nuts!!!
> How it is going ?
>
> It is not clear about the setup on Cat3920 between R1 and R4, You mention
it is SRT on
> 3920. If SRT, then you may want to try to set it to SRB and you are doing
SRBTLB.
>
> Next, it R1 and R4 connect to the same ring or just in a extended vlan
(ring-bridge-ring)?
>
> You can debug at R4 when do testing to see what packet has send across..
> Parry Chua
>
> -----Original Message-----
> From: Anand Ghody [mailto:vze2hq65@verizon.net]
> Sent: Monday, March 04, 2002 1:18 AM
> To: ccielab@groupstudy.com
> Subject: translational bridging driving be nuts!!!
>
>
> Alright, I have no idea why this is not working and need help. I
> checked previous posts and made some adjustments but it still does not
> work Need help!!!
>
> heres the setup
>
> r3 (e0, 172.16.3.2) -> catalyst 5505 port 2/2 -> catalyst 5505 port 2/1 ->
> r4 (e0) -> r4 (to0) -> cat 3900 port 1 ->cat 3900 port 6 -> r1 (to0,
> 172.16.3.1)
>
>
> I have disable ip routing on r4 and also setup bridge 1 bitswap-layer3
> address
>
> the ports on the cataylst 5500 are on the same vlan
> the port on the cataylst 3900 are also in the same vlan and setup for srt
>
> If I but an ip address on r4 token ring I can ping it from r1
>
> I'll past the configs to make it easier
>
>
> r3 config
> !
> interface Ethernet0
> ip address 172.16.3.2 255.255.255.0
>
> |
> connnects to catalyst 5500
> |
>
> r4 config
> no ip routing
> no ip finger
> !
> !
> source-bridge ring-group 100
> source-bridge transparent 100 3 2 1
> !
> !
> interface Ethernet0
> no ip address
> no ip route-cache
> bridge-group 1
> !
> interface Serial0
> no ip address
> no ip route-cache
> shutdown
> !
> interface Serial1
> no ip address
> no ip route-cache
> shutdown
> !
> interface TokenRing0
> no ip address
> no ip route-cache
> ring-speed 16
> source-bridge 1 2 100
> !
> ip classless
> no ip http server
> !
> bridge 1 protocol ieee
> bridge 1 bitswap-layer3-addresses
> !
>
> |
> connects to catalyst 3900
> |
>
> r1 config
> !
> interface TokenRing0
> ip address 172.16.3.1 255.255.255.0
> ring-speed 16
>
>
>
>
> .
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