2901 router

[Jon Are Endrerud]

I have 2901 cisco router.

Running one gateway on it, is it possible to add more vlans or use psyical interfaces to run multiple gateways? Its important that they are seperat, that the routes are for each interface.

Regards j

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[Lei Tian]

Hi,

Yes, you can create multiple sub-interface under one physical interface, each sub-interface is a gateway for that subnet.

HTH,

Lei Tian

[Jon Are Endrerud]

I dont want routing between the different interfaces, but as I understand this is not possible? I need extra gateways because of a asa firewall move and the traffic cannot be mixed.

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[Lei Tian · Accepted solution]

Yes, that is possible. Just put each sub-interface in a VRF. Consider each VRF as seperate routing table.

HTH,

Lei Tian

[Jon Are Endrerud]

I haved added this to the Cisco 2901 config:

interface GigabitEthernet0/0

no ip address

duplex auto

speed auto

!

interface GigabitEthernet0/0.2700

encapsulation dot1Q 2700

ip vrf forwarding vpn

ip address 10.0.122.5 255.255.254.0

I now have full connectivity to the 10.0.122.5 in 2700 vlan. But how do i configure static routes, or maintain a seperat routing table for just this vlan/vrf ?

[cadet alain · Accepted solution]

Hi,

you have to define your VRF first:

ip vrf vpn

rd 1:1

then add interfaces to that vrf( what you did) and there will be a global routing table( for interfaces not in VRFs) and one RIB per VRF.

you'll have to issue sh ip route vrf * to see all RIBs( including global one).

for static routing you just have to use the keyword vrf(followed by vrf name) or global depending on your need and for testing connectivity don't forget to add the keyword vrf followed by the vrf name in your ping, traceroute,... commands.

Regards

Alain

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[Jon Are Endrerud]

Thanks for advice from both of you. This solved alot of problems for me.