From: donkeytom (t.nooning@insightbb.com)
Date: Sat May 21 2005 - 20:53:56 GMT-3
Simon,
Got bored with mac access-lists so I thought I'd run through your scenario.
I did it with two 2610's and a 2621 all running c2600-j1s3-mz.122-15.T9.bin.
Worked on the first try and through a few subsequent attempts. I tried with
with R6 as the root bridge for VLANs 1 and 4 and again with the 3550 as
root. Some config snippets below, let me know if there's anything in
particular you'd like to see. Also, I never saw any STP inconsitency, so
maybe you have something else going on. But why that would only affect ISL,
I don't know.
switch to Rtr1:
Operational Mode: static access
Access Mode VLAN: 4 (VLAN0004)
switch to Rtr5:
Operational Mode: static access
Access Mode VLAN: 1 (default)
switch to Rtr6:
Operational Mode: trunk
Operational Trunking Encapsulation: isl
Negotiation of Trunking: Off
Trunking Native Mode VLAN: 1 (default)
Rack1R6#sh bridge 1 ver
Total of 300 station blocks, 294 free
Codes: P - permanent, S - self
BG Hash Address Action Interface VC Age RX count TX
count
1 31/0 00d0.ba26.b180 forward Fa0/0.4 - 3 11
10 <--------- Rtr1
1 72/0 00b0.64f3.7200 forward Fa0/0.1 - 3 1
0
1 80/0 0030.80de.8000 forward Fa0/0.1 - 0 11
10 <--------- Rtr5
1 E6/0 000a.f49a.6680 forward Fa0/0.1 - 0 42
0
1 EA/0 000b.5f23.eb01 forward Fa0/0.1 - 3 3
0
1 EB/0 000b.5f23.eb00 forward Fa0/0.1 - 0 41
0
Flood ports (BG 1) RX count TX count
FastEthernet0/0.1 152 7
FastEthernet0/0.4 7 152
Rtr6 config:
bridge irb
bridge 1 priority 0
bridge 1 protocol ieee
!
interface FastEthernet0/0
no ip address
duplex auto
speed auto
!
interface FastEthernet0/0.1
encapsulation isl 1
bridge-group 1
!
interface FastEthernet0/0.4
encapsulation isl 4
bridge-group 1
-Tom
----- Original Message -----
From: "simon hart" <simon.hart@btinternet.com>
To: <gladston@br.ibm.com>; <ccielab@groupstudy.com>
Sent: Saturday, May 21, 2005 5:15 PM
Subject: RE: RE: Bridging on isl trunks
> The platform is................
>
> cisco 2612 (MPC860) processor (revision 0x102) with 61440K/4096K bytes of
> memory.
>
> The IOS is ...................
>
> IOS (tm) C2600 Software (C2600-J1S3-M), Version 12.2(15)T9, RELEASE
> SOFTWARE (fc2)
>
> System image file is "flash:c2600-j1s3-mz.122-15.T9.bin"
>
> I am beginning to suspect a bug here
>
> Simon
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> gladston@br.ibm.com
> Sent: 21 May 2005 21:23
> To: ccielab@groupstudy.com
> Subject: Re: RE: Bridging on isl trunks
>
>
> Simon,
>
> Could you post the IOS and platform you are using, so we can try to
> reproduce it?
>
> Trying to make a model:
>
> R1-----------bridgesw1-----bridger6
> R5-----------bridgesw1-------|
>
> There is no loop here, so I can not see STP having a role on this problem.
> No matter where the Root is, all ports will be forwarding. But a bug would
> not surprise.
>
> Do you have a Sniffer to check where packets stop?
>
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