10-22-2007 05:45 AM - edited 03-03-2019 07:16 PM
Hi,
I wanted to setup network in below manner.
Lan is having two l3 switches. They are connecting to one router for external connectivity.
Two L3 switches are running HSRP. Router is having one physical link to active L3 and another physical link to standby L3.
I wanted to know the configuration required at router side. Router model is 2621, IOS 12.2
Regards
SKRAO
10-22-2007 06:40 AM
You should run a routing protocol say EIGRP between the L3 and the router.
Also run a L3 vlan link between the L3 switches over the trunks so that it will take care of the L3 link failures between the core and the router
on the router
router eigrp 100
network 10.10.10.0 0.0.0.3
network 20.20.20.1 0.0.0.3
no auto-summary
on the core sw1 (i assume there is a trunk between the 2 and should carry all the vlans)
vlan 98
name L3 link between switches
int vlan 98
ip address 30.30.30.1 255.255.255.252
no shut
router eigrp 100
network 10.10.10.0 0.0.0.3
network 30.30.30.0 0.0.0.3
no auto-summary
on core switch 2
int vlan 98
ip address 30.30.30.2 255.255.255.252
no shut
router eigrp 100
network 20.20.20.0 0.0.0.3
network 30.30.30.0 0.0.0.3
no auto-summary
HTH
Narayan
10-22-2007 06:49 AM
Hi Narayan,
the thing is that a router cannot have two lan interfaces in the same subnet, so if this is the way they want it working, must use bridging/BVI on the router.
10-22-2007 07:36 AM
I agree Paolo and thats why i suggested using two different ip address and run a routing protocol.
If they need to have only one ip address then the config you posted is the way to go :-)
Narayan
10-22-2007 06:41 AM
int fastethernet x/y
no ip address
bridge-group 1
int fastethernet x/y
no ip address
bridge-group 1
int bvi1
ip address ...
bridge irb
bridge 1 route ip
Hope this helps, please rate post if it does!
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