1921 Router with 4G LTE interface

daleynicholson · ‎10-25-2012

For some reason my cell port on my router will flap as soon as I connect a device and have it connect to the internet. If there is nothing passing traffic the cell port stays up. I also have a tunnel that I am sending the traffic through, the tunnel drops as soon as the cell port drops.

paolo bevilacqua · ‎10-25-2012

Update IOS. If still trouble, contact the TAC.

cbalmer · ‎10-27-2012

I'm having the same issue. Sometimes the connection will stay live for a little bit - longest was 90 minutes. But once the flapping starts, it is never ending. I have two routers (2901 and 1921) both experiencing this in two different geographic locations.

I'm uploading a new IOS version to the 1921, but I'm curious if that fixed the issue for you Dailey? If not, did you find a solution? I emailed my Verizon rep already and will contact TAC if it doesn't pan out.

daleynicholson · ‎10-27-2012

I worked a TAC for it, and it ended up that we were injecting into the cell connection. After putting an outbound acl on the interface that limited the outbound info to just gre and isakamp info, we were able to make it a stable connection.

Not sure if this helps you, but I would look at seeing if that helps you.

cbalmer · ‎10-27-2012

Not quite, but that does mean TAC is the best route. I'll contact them tomorrow (if they're open on Sundays). Thank you for letting me know what you did to get it fixed!

dtristang · ‎04-25-2013

This is the configuration that i got

crypto isakmp policy 2

authentication pre-share

crypto isakmp key cisco123 address 67.21.161.218

!

crypto ipsec transform-set ASA-IPSEC esp-des esp-sha-hmac

!

crypto map bars01 1 ipsec-isakmp

description Tunnel toCOrp

set peer 67.21.161.218

set transform-set ASA-IPSEC

set pfs group1

match address 100

interface GigabitEthernet0/0.1

description Legacy vlan

encapsulation dot1Q 1 native

ip address 10.141.116.252 255.255.255.0

standby 0 ip 10.141.116.250

standby 0 priority 105

standby 0 preempt

ip tcp adjust-mss 1395

interface Cellular0/0/0

ip address 166.258.14.27 255.255.255.0

ip virtual-reassembly in

encapsulation slip

dialer in-band

dialer idle-timeout 2147483

dialer string lte

dialer-group 1

async mode interactive

crypto map bars01

ip nat inside source route-map nonat interface Cellular0/0/0 overload

ip route 0.0.0.0 0.0.0.0 Cellular0/0/0

ip route 67.21.161.218 255.255.255.255 Cellular0/0/0

access-list 100 permit ip 10.141.116.0 0.0.0.255 192.168.100.0 0.0.0.255

access-list 100 permit ip 10.141.116.0 0.0.0.255 140.140.251.0 0.0.0.255

access-list 100 deny ip any any

access-list 110 deny ip 10.141.116.0 0.0.0.255 140.140.251.0 0.0.0.255

access-list 110 deny ip 10.141.116.0 0.0.0.255 192.168.100.0 0.0.0.255

access-list 110 permit ip 10.141.116.0 0.0.0.255 any

dialer-list 1 protocol ip permit

!

route-map nonat permit 10

match ip address 110

The tunnel connection is establishing correctly but when i change the priority in he hsrp configuration of my gig 0.1 interface to be the active on this router the cellular 0/0/0 interface goes down, by the way this is going to be my redundancy.

Someone can help me?

Thanks a lot