hi! We are migrating our eol 29xx edge switch to 45xx and currently all the routing is done in the core sw 65xx. Will it be a good idea to move the routing between vlan to the 45xx switches? (the svr resouces are in different vlan from all the clients' dept vlan) What would be the advantage and disadvantage?
We are also looking at adding another pair of 65xx core sw in our new DC. As the existing 65xx will be configured as the aggreagation/distribution sw with all the dept vlan and hsrp configured on it, what need to be done on the new 65xx to maximize the switching? any new vlan required in the new 65xx to create a L3 link to the old 65xx?
quite new in this kind of setup :) pls advise. Thanks.
No you can't. The reason is this
edge switch 1 = ed1
edge switch 2 = ed2
ed1 has dual L3 uplinks to the distro switches.
ed2 also has dual L3 uplinks to the distro switches.
On ed1 we have vlan 10 - 192.168.5.0 255.255.255.0
Now lets say you rhen create the same vlan/ip subnet on ed2.
Note that with L3 switches the vlan number is local to the switch so the vlan number 10 here is largely irrelevant. What is relevant is the IP subnet being the same. So
On ed1 you have a host attached with IP address 192.168.5.20. Call this host H1.
on ed2 you have a host attached with IP address 192.168.5.30. Call this host H2.
H1 wants to send a packet to H2. Because they are on the same network H1 arps out for H2 ie. there is no need to route. But the arp stays local to ed1 ie. it never gets to ed2.
Even if somehow ed1 knew H2 wasn't local ed1 would not be able to route to the 192.168.5.0/24 network on ed2 because ed1 knows 192.168.5.0/24 is a directly connected network.
If ed1 and ed2 were L2 connected to the distro switches and the L3 vlan interfaces were on the distro switches then it would all work fine.
Hope this makes sense.