Troubleshooting Routing with SVIs
There are two big topics to investigate when troubleshooting routing over LANs with SVIs.
First, you have to make sure the switch has been enabled to support IP routing. Second, the
VLAN associated with each VLAN interface must be known and active on the local switch;
otherwise, the VLAN interfaces do not come up.
First, about enabling IP routing, note that some models of Cisco switches default to enable
Layer 3 switching, and some do not. So, to make sure your switch supports Layer 3 routing,
look to those first few configuration commands listed in the configuration checklist found in
the earlier section “Configuring Routing Using Switch SVIs.” Those commands are
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