EtherChannel Trunk - Cisco 4506 with Cisco 2960

[debcu]

Hello,
could someone help me with configuring etherchannel trunk between Cisco 4506 and 2960. I'm would like to use 2 Gigabit ports:
- 4506 (Gi3/1 and Gi3/2)
- 2960 (Gi0/1 and Gi0/2)
I'm not shure what kind of etherchannel mode should I use. On my network I've got only Cisco devices 2950, 2960, 3550, 3570, 4506.
Thanks very much.

 

[KiscoKid]

I'm assuming its a layer 2 etherchannel you are interested in configuring. You can use either LACP or PAGP or no mode at all if you wish - it doesn't matter really so long as your network remains all Cisco. If you are likely to switch from Cisco, use LACP.

Anyway to configure the ports you've identified with LACP, perform the following:

4506 (I'm assuming it's a CATOS switch - if not, following the same steps to configure as the 2960) -

set trunk 3/1 on
set trunk 3/2 on
set channelprotocol lacp 3
set port lacp-channel 3/1,3/2 mode active



2960 -

interface range gigabitethernet0/1 -2
switchport mode trunk
channel-group 1 mode active


You need to make sure that all your Gig ports have the same speed and duplex set.

 

[debcu]

Hello,
I made as you wrote but when I open Cisco CMS I see that there's normal link between those two switches not etherchannel.
On 4506 I can only use configuration as in 2960. I made also sh ver on 4506 and:

Cisco IOS Software, Catalyst 4000 L3 Switch Software (cat4000-I9S-M), Version 12.2(25)EWA7, RELEASE SOFTWARE (fc1)
Technical Support:

http://www.cisco.com/techsupport

Copyright (c) 1986-2006 by Cisco Systems, Inc.
Compiled Mon 16-Oct-06 18:23 by dchih
Image text-base: 0x10000000, data-base: 0x114EEE78

ROM: 12.2(31r)SG3
Dagobah Revision 226, Swamp Revision 32

Switch uptime is 27 minutes
System returned to ROM by power-on
System image file is "bootflash:cat4000-i9s-mz.122-25.EWA7.bin"

cisco WS-C4506 (MPC8245) processor (revision 14) with 524288K bytes of memory.
Processor board ID FOX104307G9
MPC8245 CPU at 333Mhz, Supervisor IV
Last reset from PowerUp
1 Virtual Ethernet interface
80 Gigabit Ethernet interfaces
403K bytes of non-volatile configuration memory.

Configuration register is 0x2101

How can I check if there's really etherchannel beetwen those two switches (mayby there's same command to check?)

 

[KiscoKid]

Use the "show interface gig3/1 switchport" to verify your VLAN and trunk settings. Both gig3/1 and gig3/2 must have identical VLAN settings otherwise an Etherchannel will not form. Run this command for both ports on the 4500 and ensure this is the case.

Once that is the case, run the "show interface etherchannel" command to verify which ports are channeling.

The commands I've given you are all you should need however it is imperative that the 2 switchports are identically configured for speed, duplex, trunking, VLANs allowed etc.