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Webcast-Catalyst9k
New Member

port failover on a switch

Hi all, Can anyone tell me if its possible to have somekind of port failover on a switch, ie if port 1 goes off port 2 comes on?

cheers

Carl

6 REPLIES
Cisco Employee

Re: port failover on a switch

Carl,

Which switch is this? You can configure flex links to achieve the same on the switch.

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3560/1225sea/3560scg/swflink.htm

HTH,

-amit singh

New Member

Re: port failover on a switch

this will be on a 3550 switch

New Member

Re: port failover on a switch

Isn't Etherchannel a good solution for this ?

What do you want to connect with this ?

if it's switch to switch then STP is your answer. If not Etherchannel with teaming on the server side.

New Member

Re: port failover on a switch

there will be 2 transparent firewalls connected, its like this switch A --firewall x 2 --switch B , Could I use flex links in this ?

cheers

Carl

New Member

Re: port failover on a switch

we can configure the flex-link on 3550 switches to provide the backup to a layer 2 interface.

As you have firewall connected to the ports, I would suggest use flex-link with MAC address-table move update feature if this is not configured and port 1 goes down, port 2 starts forwarding traffic. However, for a short time, switch keeps forwarding traffic to port 1 which is down.

HTH

Mohmmad Imran

Cisco Employee

Re: port failover on a switch

Carl,

Flex links is supported on 3550's starting with 12.2(25)SE series.So you have to upgrade the IOS on the switch to support the flex link feature.

I havenot tried it using the firewalls as you are designing, but its worth try giving a shot.This might work. use only one switch and connect 2 firewalls to it and then configure one switch uplink to firewall 1 as the primary link and the other uplink as the secondry link.

I am attaching a brief topology diagram for your refrence. Try configuring your 3550 switch with the above toplogy and configuration.

HTH,Please rate if it does.

-amit singh

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