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unnumbered vlan question

Occasional Advisor

unnumbered vlan question

Am I correct that so called «unnumbered vlan» feature doesn't work on dl7201(J08.03) router correctly? I simply could'n find a way to add static P-t-P route to a vlan eth interface.
Here is what I have done so far:

int loop 500
ip add /24

int eth 0/1.500
vlan 500
ip unnumbered loop 500
no shut

int eth 0/1.501
vlan 501
ip unnumbered loop 500
no shut

and what I FAILED to add:
ip route /24 eth 0/1.500
ip route /24 eth 0/1.501

May it be that there is another (smarter?) way to do this? or I misinterpreted something?
Mohieddin Kharnoub
Honored Contributor

Re: unnumbered vlan question


Both sub-interfaces eth0/1.500 and eth0/1.501 has the same IP of the loop interface, how ????

Basically the idea behind unnumbered interface is to conserve IPs on your network.

but each interface should represent a Whole subnet, and you have 2 Router Interfaces represents thew same subnet

Good Luck !!!
Science for Everyone
Occasional Advisor

Re: unnumbered vlan question

This is exactly how "ip unnumbered" should work with others P-t-P interfaces such as ppp. I have no idea why HP routers do not consider vlan intesfaces as a full featured P-t-P link. There are several docs on the subject on cisco.com with working config samples if you're interested in how it works.