InterVLAN routing with more than one switch

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Jan 13th, 2008
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We have 8 VLANs on different subnets and a 3550 doing the routing between them. Since we have three campuses, I have also installed a new 3560 in each of the other two campuses, which are connected via fibre to the 3550. I want to turn on routing on the 3560s, too, but when I issue the command "ip routing" on these switches, they become uncontactable. Traffic still seems to move through them properly, but I can no longer telnet to them. I figure this is a default gateway issue, but I'm not sure how to fix it. The 3550 has no default gateway command issued, but uses a static route to the internet gateway:


ip route 0.0.0.0 0.0.0.0 10.1.1.2


The two 3560s which need ip routing turned on, have a default gateway command set to the management VLAN:


ip default-gateway 10.2.0.1


How can I best configure this arrangement?

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glen.grant Sun, 01/13/2008 - 17:39
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When you turn on ip routing on the 3560's then you must change from a default gateway command to a default static route . You only use a default gateway when you have routing turned off.


no ip default-gateway 10.2.0.1

ip route 0.0.0.0 0.0.0.0 10.2.0.1

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