4G LTE Configuration

[T_tow]

First time setting up a 4G DMVPN failover at a site. So I was under the impression that encapsulation should be set to SLIP.  I have dual links to different ISPs on my 4451 router and the 4G will be backup.  I have no option to set encapsulation to SLIP.  Should I revert to using PPP?

[T_tow]

Ok.  Yeah hopefully it's just the antenna.  I'll keep you in the loop.   

Thanks 

[T_tow]

Was def. the antenna.  As soon I screwed them in the WWAN started blinking.  Now to get my EIGRP going!  

[mrczr]

Same problem here, with cisco ISR4321/K9,  Software Version 03.16.06.S....

I tried with other encapsulation types too same "unsupported encap type" message comes up.

The default encapsulation is HDLC and i cant change this.

C4321#sho inter cel 0/1/0
Cellular0/1/0 is up (spoofing), line protocol is up (spoofing)
Hardware is 4G WWAN NIM - Global Multimode(Europe) LTE/DC-HSPA+/HSPA+/HSPA/UMTS/EDGE/GPRS
MTU 1500 bytes, BW 50000 Kbit/sec, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, loopback not set
Keepalive not supported
DTR is pulsed for 1 seconds on reset
Last input never, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
C4321#

[Josh.Walker]

I found that if you want to put the cellular interface into a VRF and configure a tunnel interface to use that vrf "tunnel vrf <VRF>" then the dialer group wont see any traffic because the tunnel wont know how to generate the GRE or IKE packet until after the interface has an IP address. Also, I am running IOS 16.6.x and for some reason dialer-watch in my version of code is not vrf enabled. Due to the lack of vrf support for dialer-watch, when the router reboots the interface just sits there. I would have to create a script to shut no shut the interface after each reboot to use dialer-watch.

With that all said I just created an IPSLA script to monitor my head end and send me alerts if it became unreachable as my method to generate interesting traffic for the dialer group. IPSLA is vrf enabled and does not seem to have any issue with sourcing from an interface that does not yet know it's IP address. (I also tried mapping the tunnel to a loopback, doing nat inside on the loopback and outside on the Cellular interface BUT while my router does have Static NAT VRF listed as a supported feature the feature does not extent to using an interface for global with a VRF specified)

I should hope that a stead ping is not enough to send your cellular bill through the roof but I am sure it could be tuned to send  less frequently:

!!CONFIGURATION Specific to ISR1k
!!SLA config
ip sla 300
icmp-echo <HEADEND_IP> source-interface Ce0/2/0
vrf INET
threshold 500
timeout 1500
frequency 5
ip sla schedule 300 life forever start-time now
!
track 123 ip sla 300 reachability
delay down 15 up 20
!
!!!EVENT MANAGER
snmp-server enable traps event-manager
event manager applet IPSLA-UP
event track 123 state up
action 1.0 syslog priority alerts msg "headed is reachable"
action 2.0 snmp-trap strdata "headed is reachable"
event manager applet IPSLA-DOWN
event track 123 state down
action 1.0 syslog priority alerts msg "headed is reachable"
action 2.0 snmp-trap strdata "headed is reachable"
!
interface Cellular0/2/0
description 50M/300M Cellular DIA(CID:REFERENCE SIM)
bandwidth receive 300000
ip vrf forwarding INET
ip address negotiated
load-interval 30
dialer in-band

dialer idle-timeout 0
dialer-group 1
pulse-time 1
end
!
dialer-list 1 protocol ip permit
!
ip route vrf INET 0.0.0.0 0.0.0.0 Cellular0/2/0 permanent
!OR if you are getting default route from your provider when you get your IP address:
ip route vrf INET <HEADEND_IP> 255.255.255.255 Cellular0/2/0 permanent
!
!!END CONFIGURATION Specific to IS1k