07-23-2009 02:09 AM - edited 07-03-2021 05:51 PM
Hello,
I want to implement a backup link between switches without enabling STP. I'm looking for something similar to Flex Links, but, to use Flex Links, the 2960 switch must be running the LAN Base Image, and the switches that I want to configure are running the LAN Lite Image.
Do you know something similar to Flex Links that I can use with Catalyst 2960 Lan Lite image switches?
Thanks in advance.
07-23-2009 05:18 AM
Is it between the same two switches? Can you use etherchannel?
Regards,
Roman
07-23-2009 05:50 AM
I cannot use etherchannel. The link is not between the same two switches. One link connect to a switch and the backup one to an bridge/access point.
Thank you for the answer.
07-23-2009 01:30 PM
I see. Why not use spanning tree?
07-23-2009 10:49 PM
Because the backup path will be connected to a 1300 wireless bridge. I've atthached a picture with the topology.
I don't wan to use STP because I want to avoid that, due to a topology change, the STP blocks the Switch B port that is connected to the AP-B. If this port is blocked, Switch D will lost the connection too.
07-24-2009 10:23 AM
AP-B treats those two bridge links as two separate VirtualDot11 interfaces each with its own STP state. Depending on which switch is a root bridge, you can get AP-B in AP-C in blocking state, and all other paths in forwarding. If you make switch A a root bridge and all wired links are the same cost, you'd have AP-B or AP-C block that APB-APC link, and APB-APD would be forwarding.
Regards,
Roman
03-23-2010 12:25 AM
Hi
Can you please tell me how to configure flex link between 2 2960 switches.
primary link should be on switch1 and backup link should be on switch2.
Your help is greatly appreciated.
Regards
Vinod
03-23-2010 01:29 AM
A simple example of flexlink is:
Switch# configure terminal
Switch(conf)# interface gigabitethernet0/1
Switch(conf-if)# switchport backup interface gigabitethernet0/2
Switch(conf-if)# end
In this case, when the gigabitethernet01 (the active link) goes down, the gigabitethernet0/2 will forward traffic.
But, when the active link goes up again, it will not preempt the backup link (the backup link will forward traffic until it fails).
To avoid this, You can configure preemption:
Switch# configure terminal
Switch(conf)# interface gigabitethernet0/1
Switch(conf-if)#switchport backup interface gigabitethernet0/2 preemption mode forced
Switch(conf-if)#switchport backup interface gigabitethernet0/2 preemption delay 50
Switch(conf-if)# end
For more information, you can access this link:
http://www.cisco.com/en/US/docs/switches/lan/catalyst2960/software/release/12.2_52_se/configuration/guide/swflink.html#wp1057556
Best regards,
César.
03-23-2010 03:07 AM
Hi,
Thanks for the reply.
But I am using 2 different switches.
Primary link will be on first switch and backup link will be on second
switch.
Regards
Vind
On Tue, Mar 23, 2010 at 1:59 PM, cdelafuente31 <
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