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restrict dhcp scope on Cisco 2620 router

We have an old Cisco 2620 XM router with the wrong version of firmware to create ISL links. We are installing an Avaya IP Office VOIP system which has to use its own DHCP Server. Is there a way on my routers DHCP server to exclude the Avaya phones, possibly by MAC address so that I can have 2 dhcp servers on one subnet

ASKER CERTIFIED SOLUTION

ArneLovius

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JMcHale

ASKER

I tried multiple VLANS my problem is the router does not have IP advanced firmware without that I cannot create the sub intervafaces I need for ISL trunking between the switch and the router. Can you explan more how to add the 242 option on the cisco router.

ArneLovius

what IOS version are you running ?
what interface are you trying to create the ISL link on ?
what model switch is it ?

JMcHale

ASKER

IOS is version 12.3 on the 2620xm router. That is the issue not the switch. I can create the VLANS and trunk port on the switch. I can create the sub interfaces on the router. However when I enter 'encapsulation ISL' I get an invalid command error. I verifed we only have bridging firmware and you have to have at least IP based in order to create the ISL links. The router is EOL so I cannot download new firmware.

ArneLovius

aaah, you might not have ISL, but you should have dot1Q

you would need the switch to support 802.1q as well...

JMcHale

ASKER

I will check futher but I thought I tried that.

JMcHale

ASKER

I've requested that this question be deleted for the following reason:

I was not able to accomplish using a separate dhcp server for the avaya phones.

ArneLovius

dot1q is available on IPBase on 12.3

ArneLovius

I would go with either accepting 38177381 as the solution and 38178960 as an assist, or as a delete with no refund.