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I have 2 Cisco 7200s, with 3 interfaces. We will call them
routerleft and routerright. They are connected via their ethernet
interfaces to 2 switches: Catalyst 3548XLs, switchleft and
switchright. The switches are divided into 3 vlans each: vlan1,
vlan2, vlan3. The switches are connected via their Gi ports
(essentially to mirror each other.
Sooooo
Router right fa1/0 goes to switchright:port 1, vlan 1, fa 1/1 to port
1, vlan2 (port 17), and fa 2/1 to port 1, vlan3 (port 33).
Router left fa1/0 goes to switchleft:port 1, vlan 1, fa 1/1 to port
1, vlan2 (port 17), and fa 2/1 to port 1, vlan3 (port 33).
Each router interface is running HSRP...so routerright fa 1/0 is hsrp
with router left fa 1/0 and so on with each interface
Router right interfaces have priority preempt set to 120 and router
left has priority preempt 100
We are doing just fine until I plug router right into the switch
right interfaces....Obviously there is a spanning tree loops and
ports start blocking.
So then...I turn off spanning tree in all vlans....and the hsrp
starts flapping.....every 2 minutes or so there is a 30 second state
change...
Is there some way I can get the routers to shut up...let one be
active the other be standby and still have everything connected? I
currently do it with Extreme Summit 48s..spanning tree is completely
off....and its works fine...
Thanks!
Blake
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