HSRP Implement with 3No.s Core Switch

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Hi All,

I'm having 4 no.s 3750 as Distribution switching connecting as per standard Cisco Layer Architechture to Core1 & Core2, HSRP is running over there. Both Core Switch are 4506. Now we want a DR site for my DC outside ( within 10KM), and it will simply extending my LAN through Ethernet Over Fiber Channel. I want othe FO connectivity from all Distribution switch to a 3rd Core ( Core_3) switch 4506.

Please let me know if it is possible to have 3 switch pointing towards single gateway ( standby ) IP, as normal we do the with 2nos. Core switch. I'm not sure it can be done with 3no.s of switch also.

If Core_1 & Core_2 both will go down then Core_3 will come in the picture...is it also require any link to be conneced from Core_1 & Core_2 to Core_3 ?

Please look into the PPT....you can understand my existing setup...

I have this problem too.
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Jon Marshall Wed, 05/12/2010 - 02:38

[email protected]

Hi All,

I'm having 4 no.s 3750 as Distribution switching connecting as per standard Cisco Layer Architechture to Core1 & Core2, HSRP is running over there. Both Core Switch are 4506. Now we want a DR site for my DC outside ( within 10KM), and it will simply extending my LAN through Ethernet Over Fiber Channel. I want othe FO connectivity from all Distribution switch to a 3rd Core ( Core_3) switch 4506.

Please let me know if it is possible to have 3 switch pointing towards single gateway ( standby ) IP, as normal we do the with 2nos. Core switch. I'm not sure it can be done with 3no.s of switch also.

If Core_1 & Core_2 both will go down then Core_3 will come in the picture...is it also require any link to be conneced from Core_1 & Core_2 to Core_3 ?

Please look into the PPT....you can understand my existing setup...

HSRP is not limited to 2 switches. So yes you can run HSRP between 3 switches if that is what you want to do. As long as there is L2 adjacency between all the core switches you will be fine.

Jon

Jon Marshall Tue, 05/18/2010 - 02:36

[email protected]

Hi,

Please send me a sample HSRP config for a single VLAN for Core_1, 2 & 3

core 1

=====

int vlan 10

ip address 192.168.5.2 255.255.255.0

standby 10 ip 192.168.5.1

standby 10 authentication

standby 10 preempt

standby 10 priority 110

core 2

=====

int vlan 10

ip address 192.168.5.3 255.255.255.0

standby 10 ip 192.168.5.1

standby 10 authentication

standby 10 priority 100

core 3

=====

int vlan 10

ip address 192.168.5.4 255.255.255.0

standby 10 ip 192.168.5.1

standby 10 authentication

standby 10 priority 90

Jon

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Jon Marshall Tue, 05/18/2010 - 06:37

[email protected]

Hi Jon,

Please confirm me if I need to make a physical connection to Core_3 from Core_2, as in generally we do a direct connection ( may be a etherchannel ) in between Core_1 & Core_2.

Or I have to make a tringle connection in between Core_1, Core_2 & Core_3.

Each switch needs to be L2 adjacent to the other switches so

core1 -> L2 -> core2 -> L2 -> core 3  would be fine.

Jon

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