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Voip Issues? and VLAN'ED Network

I've been the systems administrator here Since May. I'm hoping someone can help me as I often have a lot on my plate and cantg devote the time to learn cisco as much as Id like.

Background: We have 2 ds3 connections (44Mbps) each coming into our router on one DS3 plugin card. the router(7206VXR) is plugged into a 3500 series Switch. We then have 2900XL Catalyst switches that are come off the 3500. Our customers are plugged into a port on one of the catalyst switches. Every customer gets a VLAN and we set the switchport for that VLAN. The network is only layer 2 Im told. All the VLANS are terminated at the router. Therefore we have 340 sub interfaces. We're having to run a compressed config right now.

A new customer of ours complains about poor quality with his Voip server running Asterisk.

The customer is using 2 VLANS

He has a special static route to route thru his other VLAN.

his statis route looks like this

ip route

normally we route all traffic thru vlan

like this.

ip route Null0 254

but his current route does not belong to a sub interface. since all of our traffic is VLANed normally, could this be the problem.

Our Sub int looks like this :

interface FastEthernet0/0.301

description Voip Customer vLan

encapsulation dot1Q 301

ip address

ip broadcast-address

no ip redirects

no ip proxy-arp

no cdp enable


I did find a bad static route and removed it which could have been the problem. I would appreciate comments on

our setup and if you see any other errors.

We were thinking about priortizing packets sent to a certain port range. Would that have an adverse effect on the network?

Thanks in advance for any and all help..

Heres the sh ver for core router

Cisco Internetwork Operating System Software

IOS (tm) 7200 Software (C7200-IS-M), Version 12.2(31), RELEASE SOFTWARE (fc2)

Technical Support:

Copyright (c) 1986-2005 by cisco Systems, Inc.

Compiled Thu 11-Aug-05 15:58 by tinhuang

Image text-base: 0x60008940, data-base: 0x61312000

ROM: System Bootstrap, Version 12.0(19990210:195103) [12.0XE 105], DEVELOPMENT SOFTWARE

BOOTLDR: 7200 Software (C7200-IS-M), Version 12.2(31), RELEASE SOFTWARE (fc2)

core0 uptime is 6 weeks, 1 day, 18 hours, 26 minutes

System returned to ROM by power-on

System restarted at 17:30:51 cst Mon Jan 8 2007

System image file is "slot0:c7200-is-mz.122-31.bin"

cisco 7206VXR (NPE300) processor (revision B) with 229376K/65536K bytes of memory.

Processor board ID 16066258

R7000 CPU at 262Mhz, Implementation 39, Rev 1.0, 256KB L2, 2048KB L3 Cache

6 slot VXR midplane, Version 2.0

Last reset from power-on

Bridging software.

X.25 software, Version 3.0.0.

PCI bus mb0_mb1 (Slots 0, 1, 3 and 5) has a capacity of 600 bandwidth points.

Current configuration on bus mb0_mb1 has a total of 200 bandwidth points.

This configuration is within the PCI bus capacity and is supported.

PCI bus mb2 (Slots 2, 4, 6) has a capacity of 600 bandwidth points.

Current configuration on bus mb2 has a total of 180 bandwidth points

This configuration is within the PCI bus capacity and is supported.

Please refer to the following document "Cisco 7200 Series Port

Adaptor Hardware Configuration Guidelines" on CCO <>,

for c7200 bandwidth points oversubscription/usage guidelines.

1 FastEthernet/IEEE 802.3 interface(s)

2 Serial network interface(s)

125K bytes of non-volatile configuration memory.

16384K bytes of Flash PCMCIA card at slot 0 (Sector size 128K).

4096K bytes of Flash internal SIMM (Sector size 256K).

Configuration register is 0x2102


Re: Voip Issues? and VLAN'ED Network