Router acting as DHCP server, need to add 2nd cable for redundancy.
We have a typical L3/L2 campus network. We have 2 core L3 switches and 8 L2 switches that trunk to both cores. Off one core we have a router which is our DHCP server for all our VLANs. It's IP is 192.168.21.1/24 and it's gateway is 192.168.21.254/24 which is the VLAN 21 (HSRP) on the 2 cores.
I want to add a second cable to the DHCP router and add it to the other core for redundancy, I can't put it in the same subnet, is it best I just put it in another vlan the L2 switch can get to?
I think at some point we can get a server where we can give both nics the same virtual IP and bundle them.
All these years I didn't know a router could do that, I have don't many a tim eon switches. I've configured it like this, but can't ping 192.168.21.1 from the cores yet.
interface Port-channel1 ip address 192.168.21.1 255.255.255.0 hold-queue 150 in ! interface FastEthernet0/0 no ip address duplex auto speed auto channel-group 1 ! interface FastEthernet0/1 no ip address duplex auto speed auto channel-group 1
ip route 0.0.0.0 0.0.0.0 192.168.21.254
192.168.21.254 is the HSRP address the 2 cores are using.
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