InterVlan newbie here with a problem and can't seem to find the answer in the Cisco documentation.
Recently inherited control of an undocumented network consisting of one building--bldg2--with five Cisco 3524 switches and one Cisco 3550 switch with the Layer2/Layer3 IOS image Version 12.1(14)EA1a. All six are daisychained together via GBIC configured as 802.1Q trunks. We have a 3620 hung off one of the 3524s. The 3620 in bldg1 connects to a 3620 in bldg1 via a RF bridge. There's a Cisco 6509 bldg1 with 2 MSFC modules.
Everything in both buildings is using the default VLAN1 on 172.16.0.0/21. I've been tasked with changing that. To start, in bldg2, we have about 20 macs that I want to move to their own Vlan/subnet and connect to the access ports on the 3550. I created a new vlan (48) on the 3550 which is running in VTP server mode with all other switches in client mode. The Vlan replicates to the other switches in bldg2 fine. I assigned an address of 172.16.48.1/21 to the SVI for the Vlan to use as the new default gateway for the macs.
I need the macs to be able to talk to other resources on the network outside their Vlan so I need to use InterVlan routing. According to the Cisco docs, the next step to do this is to turn on routing in the 3550 by issuing the (config)#ip routing command. Once I do that, I can do a #show ip route and see the IPs for Vlan1 and Vlan48 as physically connected routes but within about 10 minutes, I lose connectivity to the 3550 from bldg1. The 3550 can't be reached from bldg1 via ping though bldg2 is fine and there's no loss of user connectivity. As soon as I turn routing off in the 3550, I can connect to the 3550 again from bldg1.
I know I'm just making a config mistake somewhere. Anyone have any suggestions?
Thanks
Recently inherited control of an undocumented network consisting of one building--bldg2--with five Cisco 3524 switches and one Cisco 3550 switch with the Layer2/Layer3 IOS image Version 12.1(14)EA1a. All six are daisychained together via GBIC configured as 802.1Q trunks. We have a 3620 hung off one of the 3524s. The 3620 in bldg1 connects to a 3620 in bldg1 via a RF bridge. There's a Cisco 6509 bldg1 with 2 MSFC modules.
Everything in both buildings is using the default VLAN1 on 172.16.0.0/21. I've been tasked with changing that. To start, in bldg2, we have about 20 macs that I want to move to their own Vlan/subnet and connect to the access ports on the 3550. I created a new vlan (48) on the 3550 which is running in VTP server mode with all other switches in client mode. The Vlan replicates to the other switches in bldg2 fine. I assigned an address of 172.16.48.1/21 to the SVI for the Vlan to use as the new default gateway for the macs.
I need the macs to be able to talk to other resources on the network outside their Vlan so I need to use InterVlan routing. According to the Cisco docs, the next step to do this is to turn on routing in the 3550 by issuing the (config)#ip routing command. Once I do that, I can do a #show ip route and see the IPs for Vlan1 and Vlan48 as physically connected routes but within about 10 minutes, I lose connectivity to the 3550 from bldg1. The 3550 can't be reached from bldg1 via ping though bldg2 is fine and there's no loss of user connectivity. As soon as I turn routing off in the 3550, I can connect to the 3550 again from bldg1.
I know I'm just making a config mistake somewhere. Anyone have any suggestions?
Thanks
