From: Mike Schlenger (mschlenger@meridianitsolutions.com)
Date: Fri Jul 25 2003 - 18:09:40 GMT-3
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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