We have recently installed 3 4948's for a customer network. These were trunked to their 3662's. They specified using a different Vlan (Vlan24), than Vlan1 so we made sure the trunk link specfied this as the native vlan.
We had specified the default gateway as the HSRP address from the 3662, and could ping/telnet to router fine.
If we tried to ping anything beyond the router it would fail , and the debug from the switch would say 'unroutable'
To get this working from the switch, I had to set a gateway of last resort , pointing to the HSRP address on the 3662.
When the switch temporarily has no routing capabilities, you use an ip default gateway to instruct the ip stack where to send traffic. You only use this for basic setup of the system in case of emergencies.
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