>Hi...
>
>I need to solve a network slowness problem. First, let me tell you
>about our network. All our PCs are connected to 2 X 5500 switches
>with RSM and divided into 3 VLANs 1,2,3 on each swtich. Both
>switches are connected to each other via trunks and HSRP configured.
>VLANs are routed via RSM in 5500s. By right, implementation of VLAN
>can increase the performance and speed, and 5500 switch also a high
>end switches. But our network is very SLOW.
Measurements? Exactly what do you mean by slow?
>All parameter have been checked including the duplex type and speed
>of the ports match with NIC. I suspect can it be the bottleneck of
>routing process in RSM due to overwhelming packet for routing? Each
>5500 are connected about 40 PCs. How to determined the utilization
>of RSM ? what is the limit?
>
>Besides, both 5500 are connected to the company WAN via two 1700
>routers. And our network is extremely slow when accessing the WAN
>especially on the Citrix traffic although we have prioritize the
>citrix traffic. I don't know what is the reason? We have two links
>128K, and 256K, it should be fast. I doubt whether the bandwidth is
>correct or not? When I see the output of #sh interface as shown
>below. Can u say that it is 256K ?
Wait a minute. How much of the traffic goes to the WAN? In other
words, you have 3 10 or 100 Mbps LANs that have to go out 128+256K?
If more than a fraction of your traffic goes to the WAN, that
probably explains things right there.
>
>MTU 1500 bytes, BW 256 Kbit, DLY 20000 usec
>
>I heard from my friend that Cisco router is poor in handling citrix
>and netbios traffic, is that true??
Citrix and NetBIOS are broadcast intensive. If the router has to do
broadcast forwarding or replication, that will increase load. In
general, the first problem with broadcasts is their interrupt load on
host CPUs.
How many hosts do you have per VLAN? With a broadcast-intensive
protocol, it's often unwise to have more than 100-200. 40 sounds OK.
Once hosts slow down handling broadcasts (and multicasts), then
certain of their requests (e.g., NetBIOS name queries) may time out
and you then get broadcasts storms. Individual broadcast
>We are using OSPF in our WAN, but RIP in RSMs. Could the difference
>in routing protocol slow down the network?
>
>
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