All other VLAN traffic slow on 4200G

[JordanCN]

I have a stack of 3com 4250 units. They are the 10/100 x 48 ports with the two GB ports. I had the max of 4 unit setup in a stack and used a single subnet 192.168.1.x.My network grew so I needed to subnet out the network so I purchased at 4200G. 12 GB ports and Layer 3.When I first setup my subnetting I left the physical structure in place. I put the 4 servers I have on 4 ports on the 4200G and plugged the stack of the 4250s into another of the ports. I then setup the VLANs for 4 subnets of 192.168.1.x thru 4.x. I tagged the link between the 4200G and 4250 stack and the traffic was going thru, however all the traffic on the other VLANs to the default VLAN is dramatically slower now trying to reach the servers. Even with ports side by side on the same physical switch, but with one on the default VLAN and one on the other VLANS.I even tried to remove one of the switches out of the stack of 4 and plug it into the 4200G and setup the VLANs however that still has not helped.I have been running some tests and the speed between the servers all on the default VLAN to all the default VLAN clients is at least 3x that of any client on the other VLANS.

 

[VinceWhirlwind]

do a "sh ip rout" on your core switch...?

 

[JordanCN]

That does not appear to be a valid command on either the 3com 4200G or the 4250 units however I am assuming that you want to see the routing table:

Destination/Mask Protocol Pre Cost Nexthop Interface

0.0.0.0/0 STATIC 60 0 192.168.1.2 Vlan-interface1
127.0.0.0/8 DIRECT 0 0 127.0.0.1 InLoopBack0
127.0.0.1/32 DIRECT 0 0 127.0.0.1 InLoopBack0
172.28.0.0/16 STATIC 60 0 192.168.1.210 Vlan-interface1
192.168.1.0/24 DIRECT 0 0 192.168.1.254 Vlan-interface1
192.168.1.254/32 DIRECT 0 0 127.0.0.1 InLoopBack0
192.168.2.0/24 DIRECT 0 0 192.168.2.254 Vlan-interface2
192.168.2.254/32 DIRECT 0 0 127.0.0.1 InLoopBack0
192.168.3.0/24 DIRECT 0 0 192.168.3.254 Vlan-interface3
192.168.3.254/32 DIRECT 0 0 127.0.0.1 InLoopBack0
192.168.4.0/24 DIRECT 0 0 192.168.4.254 Vlan-interface4
192.168.4.254/32 DIRECT 0 0 127.0.0.1 InLoopBack0

 

[JordanCN]

It figures. After weeks of trying all sorts of things I end up figuring it out they day after I post.

The routes were correct on the 4200G and the stack was correct as well. It turns out that on the ervers I also ad them listed with the default gateway of 192.168.1.2 (router to Internet) and the .2 unit had the static routes for the .2.x .3.x and .4.x networks so the traffic would route however it would bounce off the slow internet router first.

I make sure the servers also had the 4200G as the default gateway and all started working fast.