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Can we combine 2 interfaces on same router

Can we combine 2 interfaces on same router for redundancy purpose, like we do port channelling on switch.

I know for redundancy on 2 layer3 device we can use routing protocols like HSRP,VRRP...

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 .

Regards

Arulkumar

4 ACCEPTED SOLUTIONS

Accepted Solutions
Blue

Re: Can we combine 2 interfaces on same router

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 .

Multilink PPP

http://blogs.techrepublic.com.com/networking/?p=498

HTH

Victor

Hall of Fame Super Silver

Re: Can we combine 2 interfaces on same router

Hello Arulkumar,

you could use IRB integrated routing and bridging

int f0/0

no ip address

bridge-group 1

int f0/1

no ip address

bridge-group 1

bridge 1 protocol ieee

bridge 1 route ip

interface BVI1

! here L3 configuration

ip address x.x.x.x 255.255.255.y

! HSRP config

the router will run STP 802.1D (protocol IEEE) and will interact with STP on switches

ensure that the switches are primary and secondary root bridge for the vlan

Note: the command may be supported only on physical interfaces and not on subinterfaces depending on platform and IOS image

only one interface is active at a given time if the device is not the STP root bridge.

Edit:

I made the hyphotesis that you were referring to a LAN environment

For a WAN environment as suggested by Victor multilink PPP or multilink FR could be used.

Hope to help

Giuseppe

New Member

Re: Can we combine 2 interfaces on same router

Hello

you can have L3 etherchannels for ethernet family of interfaces. I have seen 10G port channels between GSRs in a Tier 1 ISP i worked for.

just have a look at this ---> http://www.cisco.com/en/US/docs/ios/12_1t/12_1t5/feature/guide/dtfec.html

If you want to bundle POS interfaces you have POS channel.

These are in addition to those which are already mentioned like MLPPP, IRB etc.

Of course these might have IOS version dependencies

New Member

Re: Can we combine 2 interfaces on same router

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.

8 REPLIES
Blue

Re: Can we combine 2 interfaces on same router

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 .

Multilink PPP

http://blogs.techrepublic.com.com/networking/?p=498

HTH

Victor

Hall of Fame Super Silver

Re: Can we combine 2 interfaces on same router

Hello Arulkumar,

you could use IRB integrated routing and bridging

int f0/0

no ip address

bridge-group 1

int f0/1

no ip address

bridge-group 1

bridge 1 protocol ieee

bridge 1 route ip

interface BVI1

! here L3 configuration

ip address x.x.x.x 255.255.255.y

! HSRP config

the router will run STP 802.1D (protocol IEEE) and will interact with STP on switches

ensure that the switches are primary and secondary root bridge for the vlan

Note: the command may be supported only on physical interfaces and not on subinterfaces depending on platform and IOS image

only one interface is active at a given time if the device is not the STP root bridge.

Edit:

I made the hyphotesis that you were referring to a LAN environment

For a WAN environment as suggested by Victor multilink PPP or multilink FR could be used.

Hope to help

Giuseppe

New Member

Re: Can we combine 2 interfaces on same router

Hi

On the same router (at the same time) can i use IRB for LAN side and multilink PPP for WAN side?

Regards

Arulkumar

Blue

Re: Can we combine 2 interfaces on same router

never tried it. Dont see why not.

New Member

Re: Can we combine 2 interfaces on same router

Hi,

Thank you for reply

Can this be done on cisco ASA Firewall?

If so please let me know how..

Regards

Arulkumar

New Member

Re: Can we combine 2 interfaces on same router

Hi

I was able to find out how.

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“.

Regards

Arulkumar

New Member

Re: Can we combine 2 interfaces on same router

Hello

you can have L3 etherchannels for ethernet family of interfaces. I have seen 10G port channels between GSRs in a Tier 1 ISP i worked for.

just have a look at this ---> http://www.cisco.com/en/US/docs/ios/12_1t/12_1t5/feature/guide/dtfec.html

If you want to bundle POS interfaces you have POS channel.

These are in addition to those which are already mentioned like MLPPP, IRB etc.

Of course these might have IOS version dependencies

New Member

Re: Can we combine 2 interfaces on same router

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.

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