VRF Forwarding - ISR LTE Router

[abc1235]

Hallo,

Whenever I apply VRF forwarding command, the LTE router loses its IP address as is below:

 Router(config-vrf)#int cell 0/2/0

 Router(config-if)#vrf forwarding INTERNET
% Interface Cellular0/2/0 IPv4 disabled and address(es) removed due to disabling VRF INTERNET
% Interface Cellular0/2/0 IPv6 disabled and address(es) removed due to disabling VRF INTERNET
Does anyone have an idea why this could be happening? Thanks

[Harold Ritter]

Hi @abc1235 ,

This is normal behavior. Whenever you move an interface from the global routing table to a VRF or vice versa, the ipv4/ipv6 address is removed to avoid a duplicate address scenario. You need to reapply the ipv4/ipv6 address.

Regards,

[balaji.bandi]

 Router(config-if)#vrf forwarding INTERNET

When you issue VRF command what ever configuration on the interface will be defaulted, since now the Interface in different VRF ( that means no Longer in Global config) - so you need to configure again after that command issued rest of the config.

That is default behaviour move interface to VRF.

[abc1235]

Hallo @Harold Ritter and @balaji.bandi Thanks so much for the response. This is the interface's config:

interface Cellular0/2/0
description INTERNET-UPLINK-VIA-LTE
bandwidth 1000
bandwidth receive 18000
vrf forwarding INTERNET
ip address negotiated
no ip redirects
no ip unreachables
no ip proxy-arp

ip nat outside
dialer in-band
dialer idle-timeout 0
dialer-group 1
pulse-time 1

However, the ip address isn't automatically set and I have to use the following config for it to get an IP address and for the two tunnels to come up:

ip route 0.0.0.0 0.0.0.0 Cellular0/2/0

ip route vrf INTERNET 0.0.0.0 0.0.0.0 Cellular0/2/0

no ip route 0.0.0.0 0.0.0.0 Cellular0/2/0

On a rather unrelated topic, could there be a reason a router only receives UDP packets not TCP packets.

Thanks.