Re: Cat 3550 port-channel

From: Xy Hien Le (ccnp@hawaiibuyme.com)
Date: Fri Jul 25 2003 - 18:35:18 GMT-3

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Hi Mike,
Thanks for the answer, the question now is how do I stop the vlans from
propagating from swich 3550-1 to swich 3550-2?
I tried to change the vtp domain name of switch 3550-2 but it still receive
the Vlans!!!
I tried to config with the command: "switchport trunk allow vlan
remove....." but the switch rejected the command due to the facts that the
port-channel and channe-group are not switchports!
Regards,
Xy
----- Original Message -----
From: "Mike Schlenger" <mschlenger@meridianitsolutions.com>
To: "Xy Hien Le" <ccnp@hawaiibuyme.com>; <ccielab@groupstudy.com>
Sent: Friday, July 25, 2003 11:09 AM
Subject: RE: Cat 3550 port-channel

VTP, a layer 2 protocol, if configured, transmits vlan information
across all trunk ports. (Depending on the VTP mode your switch is in).
When port channeling is configured, the ports participating in the
channel become trunk ports.

http://www.cisco.com/en/US/tech/tk389/tk689/technologies_tech_note09186a
0080094c52.shtml#ustand

Mike

Michael Schlenger
CCIE #7079
Meridian IT Solutions
mschlenger@meridianitsolutions.com
847.592.3912

-----Original Message-----
From: Xy Hien Le [mailto:ccnp@hawaiibuyme.com]
Sent: Friday, July 25, 2003 3:42 PM
To: ccielab@groupstudy.com
Subject: Cat 3550 port-channel

Hi everyone

quick question:

Why do the vlans still passing through two 3550 switches when both
connected via a Port-Channel bundled by a Channel-group, assigned an ip
address on both sides? I thought Channel Group with a layer 3 address
would not permit any Vlan to pass through... am I missing something?

Any idia on this?

Enclosed are the configs of 2 switches:

interface Port-channel1
 no switchport
 ip address 10.35.35.1 255.255.255.0

interface FastEthernet0/21
 no switchport
 no ip address
 channel-group 1 mode desirable
!
interface FastEthernet0/22
 no switchport
 no ip address
 channel-group 1 mode desirable
!
interface FastEthernet0/23
 no switchport
 no ip address
 channel-group 1 mode desirable
!
interface FastEthernet0/24
 no switchport
 no ip address
 channel-group 1 mode desirable
........

cat3550-2

interface Port-channel1
 no switchport
 ip address 10.35.35.2 255.255.255.0

interface FastEthernet0/21
 no switchport
 no ip address
 channel-group 1 mode desirable
!
interface FastEthernet0/22
 no switchport
 no ip address
 channel-group 1 mode desirable
!
interface FastEthernet0/23
 no switchport
 no ip address
 channel-group 1 mode desirable
!
interface FastEthernet0/24
 no switchport
 no ip address
 channel-group 1 mode desirable
!

Thanks in advance,

Xy

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