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2811>hsrp on e0+e1>loopback0>asyncline can I do it?

I'm trying to see if I can use both ethernet ports on a 2811 to run hsrp for non-stacked dual switch failover.  Then link the the NM-32A ports to L0, so the remote access server trying to use them can use the l0 ip and failover much faster (it's programming is limited).  This is on IOS 12.4(25)f, though we are moving to 15 soon.

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Hall of Fame Super Silver

2811>hsrp on e0+e1>loopback0>asyncline can I do it?

Hello pmickelsen,

you cannot run HSRP between two LAN interfaces of the same router, because you cannot configure two IP addresses belonging to the same IP subnet on a single box.

In order to achieve redundancy towards the two unstacked switches you could use IRB integrated Routing Bridging

int eth0

no ip address

bridge-group1

int eth1

no ip address

bridge-group 1

interface BVI1

description layer3 info here

bridge 1 route ip

bridge 1 protocol ieee

Be aware that this configuration will introduce STP IEEE on the router physical interface and router STP will interact wih STP running on the two LAN switches.

One interface will be in STP blocking if STP root bridge is on the LAN switches.

Usually for terminal server the two lan interfaces are configured for two different IP subnets and or static routes or a routing protocol is used to advertise the terminal server loopback address to two different routers or multilayer switches.

Hope to help

Giuseppe

2 REPLIES
Hall of Fame Super Silver

2811>hsrp on e0+e1>loopback0>asyncline can I do it?

Hello pmickelsen,

you cannot run HSRP between two LAN interfaces of the same router, because you cannot configure two IP addresses belonging to the same IP subnet on a single box.

In order to achieve redundancy towards the two unstacked switches you could use IRB integrated Routing Bridging

int eth0

no ip address

bridge-group1

int eth1

no ip address

bridge-group 1

interface BVI1

description layer3 info here

bridge 1 route ip

bridge 1 protocol ieee

Be aware that this configuration will introduce STP IEEE on the router physical interface and router STP will interact wih STP running on the two LAN switches.

One interface will be in STP blocking if STP root bridge is on the LAN switches.

Usually for terminal server the two lan interfaces are configured for two different IP subnets and or static routes or a routing protocol is used to advertise the terminal server loopback address to two different routers or multilayer switches.

Hope to help

Giuseppe

New Member

2811>hsrp on e0+e1>loopback0>asyncline can I do it?

Thank you!  Exactly what I was looking for.

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