10-09-2008 09:19 AM - edited 03-03-2019 11:51 PM
Hi,
Is it possible to use HSRP/VRRP internal one router if you want to have redundancy between two interfaces?
Our customer has router with two Ethernet interfaces.
This two interfaces are connected to two switches, there is also cross cable between the switches.
On the other side of the switches there are two other routers connected.
The customer will not use any routing protocols to get redundancy between the standalone router and the two separated routers.
Need some ideas how we can solved this.
//Niklas
Solved! Go to Solution.
10-09-2008 12:32 PM
Hello Niklas,
you can use IRB integrated routing and bridging: HSRP will not work as well explained by Jon.
bridge 1 protocol ieee
bridge 1 route ip
bridge 1 bridge ip
int eth0
no ip addr
bridge-group 1
int eth1
no ip addr
bridge-group 1
int bv1
ip address x.x.x.x
! this the layer3 interface
be aware that STP will block one link but it will be ready to be used if the first fails
you can uses static routes with IP next hops the ip addresses of the VIP of the HSRP made on the other two routers (on them you can they are two different boxes)
the other two routers will have static routes to the BVI ip address as next hop
be aware that until a router has an ARP entry for the ip next hop and its own interface is up the static route is considered valid
Hope to help
Giuseppe
10-09-2008 09:27 AM
HSRP will not work because you cannot assign 2 IP addresses out of the same subnet on 2 ethernet interfaces on the same router.
What type of redundancy are you looking for. If you cannot use routing protocols you could look into floating statics but it's very difficult to be more precise without more details.
Jon
10-09-2008 11:09 AM
yes.
I think the best solution is to use floating static route
for example:
x.x.x.x 255.255.255.0 Fe1
x.x.x.x 255.255.255.0 Fe2 10
10-09-2008 12:32 PM
Hello Niklas,
you can use IRB integrated routing and bridging: HSRP will not work as well explained by Jon.
bridge 1 protocol ieee
bridge 1 route ip
bridge 1 bridge ip
int eth0
no ip addr
bridge-group 1
int eth1
no ip addr
bridge-group 1
int bv1
ip address x.x.x.x
! this the layer3 interface
be aware that STP will block one link but it will be ready to be used if the first fails
you can uses static routes with IP next hops the ip addresses of the VIP of the HSRP made on the other two routers (on them you can they are two different boxes)
the other two routers will have static routes to the BVI ip address as next hop
be aware that until a router has an ARP entry for the ip next hop and its own interface is up the static route is considered valid
Hope to help
Giuseppe
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