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Wednesday, March 31, 2010

Can we combine 2 interfaces on same Cisco router


Can we combine 2 interfaces on same router for redundancy purpose, like we do port channelling on switch? For redundancy on 2 layer3 device we can use routing protocols like HSRP,VRRP, etc., Is there any way we can use 2 interfaces on router to assign a single ip address, so that if 1 interface fails traffic will be forwarded through other interface?

In addition to device-level failover, we can also configure interface redundancy on the same chassis of a Cisco ASA firewall. Basically you create a logical interface pair bundle (called “interface redundant“) in which you include two physical interfaces. If one of the interfaces fail, the second one in the redundancy pair takes over and starts passing traffic. You can
configure up to 8 redundant interface pairs. After you configure the redundant interface pair, all security appliance configuration refers to this logical redundant pair instead of the member physical interfaces.
Configuration Example:
ASA(config)# interface redundant 1
ASA(config-if)# member-interface gigabitethernet 0/0
ASA(config-if)# member-interface gigabitethernet 0/1
From now on, all interface related commands must refer to “interface redundant 1“.

Also you can have L3 etherchannels for ethernet family of interface. Please click here for more information on Fast EtherChannel Enhancements on Cisco 7200 Series Routers.

There is a new Feature on the ISR-G2 29xx and 39xx which have dual-purpose GE-Interface

interface gig 0/1
media-type sfp
media-type sfp auto-failover
So the SFP of gig0/1 is the primary interface the RJ45 of the gig0/1 is the Backup-Interface.
So you do not have any need to configure BVI Interfaces.

Citation - This blog post does not reflect original content from the author. Rather it summarizes content that are relevant to the topic from different sources in the web. The sources might include any online discussion boards, forums, websites and others.

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