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Webcast-Catalyst9k
New Member

Network Help

Hi Guys,

Can someone please see if the below is possible:

Core1-----Core3-----Core2

Core 1 is HSRP Active

Core 2 is HSRP Standby

Core 3 is a layer 3 switch but not participating in the HSRP for those particular vlans. Its all trunk ports between the Core switches so they all know the vlans.

The questions I'm asking is if I put a server in a vlan for example vlan 4 which is connected to Core 3 and Core 1 is the active HSRP gateway for that vlan 4 will it be able to get access to the HSRP gateway.

I think it will as Core 3 will have that route in its routing table.

If someone can let me know that will be good.

Thanks,

Ross.

1 ACCEPTED SOLUTION

Accepted Solutions
Hall of Fame Super Gold

Network Help

Ross

It does not matter whether Core 3 has the route in its routing table or not. Assuming that Core 1 and Core 2 are participating in HSRP on VLAN 4, and assuming that VLAN 4 is on an active trunk between all 3 core switches, then HSRP should work. If the server is connected to VLAN 4 on an access port on Core 3 then it still should work (assuming that Core 3 has a correct configuration of VLAN 4 access ports and that trunking is correctly configured on the switch). If Core 1 is the active router then it will have the shared/virtual IP address and also the MAC address for HSRP. Assuming that the server is configured with its default gateway being the virtual address for HSRP in VLAN 4 then the server will ARP for its gateway address. The ARP response will come from Core 1, and the server will forward traffic to its default gateway. Core 3 participates at layer 2 in forwarding traffic but does not play a role in HSRP at layer 3.

HTH

Rick

3 REPLIES
Hall of Fame Super Gold

Network Help

Ross

It does not matter whether Core 3 has the route in its routing table or not. Assuming that Core 1 and Core 2 are participating in HSRP on VLAN 4, and assuming that VLAN 4 is on an active trunk between all 3 core switches, then HSRP should work. If the server is connected to VLAN 4 on an access port on Core 3 then it still should work (assuming that Core 3 has a correct configuration of VLAN 4 access ports and that trunking is correctly configured on the switch). If Core 1 is the active router then it will have the shared/virtual IP address and also the MAC address for HSRP. Assuming that the server is configured with its default gateway being the virtual address for HSRP in VLAN 4 then the server will ARP for its gateway address. The ARP response will come from Core 1, and the server will forward traffic to its default gateway. Core 3 participates at layer 2 in forwarding traffic but does not play a role in HSRP at layer 3.

HTH

Rick

New Member

Network Help

Thanks Rick for clearing this up.

Cheers,

Ross.

Hall of Fame Super Gold

Network Help

Ross

I am glad that my response helped to clear this up for you. Thank you for using the rating system to mark this question as answered. It helps make the forum more useful when people can read a question and can know that a correct answer was found. Your marking has contributed to this process.

HTH

Rick

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