An IGP is running between D-SW1 and D-SW2. They both advertise the Routes 10.0.0.0/24 and 126.96.36.199/24 to each other. However, since these are also their CONNECTED ROUTES, therefore, because of lower AD, both switches prefer the Connected Routes.
Now suppose that the Layer 2 Trunk between A-SW2 and D-SW2 goes down.
A host X, connected to A-SW2 in VLAN 10 wants to send some data to another host Y connected to same switch SW-2 in VLAN 20.
Therefore, X sends it’s data to D-SW1. However, D-SW1 has the route 188.8.131.52/24 as Connected, so that it does not send these packets to D-SW2 and thus the packets are dropped.
My question is that is this a recommended arrangement? i.e, should we use extended VLANs, i.e, VLANs configured on different switches while we are using MLS for interVLAN routing?
Another question is that what can we do to make this arrangement to work? A solutions coming into my mind is to Use Layer 2 Trunk between D-SW1 and D-SW2. However, as per CCNP Book, it is not recommended to use Layer 2 Links between Distribution Layer Switches to limit Broadcasts.
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