problem HSRP between sites: DLSW solution??

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Aug 5th, 2008
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Hi,


I have a network (a MAN) with different sites, connecting via EIGRP.

The routers are connected like that: R1 - R2 - R3 - R4

The central site is R1

The backup site is R4


For backuping the servers of the central site, we decided to use the same VLANs on R1 and R4.

For that, we use a Layer 2 GEC connecting directly R1 to R4.

Then, on the LANs, we use HSRP.


This solution works fine.


The problem is when the Layer 2 GEC (R1 - R4) is down.


The HSRP is active on R1 AND R4.


Is there a solution for that R1 keeps active hsrp and R4 standby hsrp?

I tried to configure a peering DLSW betwen R1 and R4, but it doesn't work.


Thanks for your help


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Giuseppe Larosa Wed, 08/06/2008 - 13:25
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Hello CHRISTOPHE,


>> For backuping the servers of the central site, we decided to use the same VLANs on R1 and R4.

For that, we use a Layer 2 GEC connecting directly R1 to R4.


Use different Vlans on main and backup site and you can take advantage of EIGRP routing.


>> The problem is when the Layer 2 GEC (R1 - R4) is down.


>>The HSRP is active on R1 AND R4.


Yes, when GEC is down your VLANs become partioned and every router claims to be the HSRP active because it cannot listen to the other one.


>>I tried to configure a peering DLSW betwen R1 and R4, but it doesn't work


post your DLSW configuration, sh dlsw peer, sh dlsw circ, but it could depends also by the L2 link.


Hope to help

Giuseppe

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