Cisco 3G GSM + GRE Config

Cisco/Gsm4GLTE
Cisco/Gsm3G/EEMreset - Automated 3G modem reset on cisco router.
Cisco/Gsm3G/ServiceError - ServiceError
Cisco/Gsm3G/Old2012 Older config with dialer, dialer not needed
Need to add IPSec see http://www.cisco.com/en/US/docs/ios-xml/ios/sec_conn_ike2vpn/configuration/15-2mt/sec-flex-spoke.html
Cisco 3G cellular modem reset / power-cycle
- If command not available it could be that modem firmware is to old.
- #test cellular 0/3/0 modem-power-cycle
Also resets the modem.
- #cellular 0/3/0 gsm prl-region 0

Cisco 3G cellular - Firmware - NOT included with IOS on HWIC module download seperate extract .tar to flash

201303 - latest firmware for Europe 8790_k2_0_7_52.tar
201410 - check modem model with #show inventory

        archive tar /xtract "source-url" flash: 
        microcode reload cellular pa-bay slot gsm modem-provision
        !Cellular interface will shut and no shut automatically.  It can take long but runs in background.

3G Cisco router config

Details:

2 - WWW GW IP's with gre tunnels
Example: Use subnet 10.202.191.x and 10.202.192.x for tunnel termination. .1 IS HQ GW

!
chat-script gsm  "" "ATD*99*1#"    TIMEOUT 60 CONNECT
chat-script gsm+ "" "AT!SCACT=1,1" TIMEOUT 60 "OK"
!!! AT!SCACT=1,<profile_number>..."OK" (HSPA+ modem) 
!
!
interface Cellular0/3/0
 ip address negotiated
 no ip virtual-reassembly in
 encapsulation ppp
 dialer in-band
 dialer idle-timeout 0
 dialer string gsm
 dialer-group 98
 async mode interactive
 ppp authentication chap callin
 ppp chap hostname dummy
 ppp chap password 0 dummy 
 ppp ipcp dns request
 ppp ipcp address accept
 ppp timeout 600
!
! ##Dual Antenna HWIC##
interface Cellular0/3/1
 no ip address
 encapsulation ppp
!
!
interface Tunnel191
 description 3G-GRE
 bandwidth 100
 ip address 10.202.191.143 255.255.255.0
 ip nhrp group 191
 ip nhrp map multicast 10.202.191.1
 ip nhrp network-id 191
 ip nhrp nhs 10.202.191.1
 ip nhrp registration no-unique
 ip ospf network broadcast
 ip ospf flood-reduction
 ip ospf priority 0
 tunnel path-mtu-discovery
 tunnel path-mtu-discovery age-timer 30
 tunnel path-mtu-discovery min-mtu 1300
 tunnel source Cellular0/3/0
 tunnel destination {{IP-EXT-NAT-WWW1}}
!
interface Tunnel192
 description 3G-GRE-IS
 bandwidth 100
 ip address 10.202.192.143 255.255.255.0
 ip nhrp group 192
 ip nhrp map multicast 10.202.192.1
 ip nhrp network-id 192
 ip nhrp nhs 10.202.192.1
 ip nhrp registration no-unique
 ip ospf network broadcast
 ip ospf flood-reduction
 ip ospf priority 0
 tunnel path-mtu-discovery
 tunnel path-mtu-discovery age-timer 30
 tunnel path-mtu-discovery min-mtu 1300
 tunnel source Cellular0/3/0
 tunnel destination {{IP-EXT-NAT-WWW2}}
!
ip route {{IP-EXT-NAT-WWW1}} 255.255.255.255 Cellular0/3/0
ip route {{IP-EXT-NAT-WWW2}} 255.255.255.255 Cellular0/3/0
!
dialer-list 98 protocol ip permit
!
line 0/3/0
 script dialer gsm
 no exec
 rxspeed 7200000
 txspeed 2000000
!
router ospf 1
 network 10.202.191.0 0.0.0.255 area 0
 network 10.202.192.0 0.0.0.255 area 0
!

Core routers, can be one or two routers, external IP's nated to 10.10.240.191 & 192

!
interface Loopback191
 description TunnelSRC-nat-{{IP-EXT-NAT-WWW1}}
 ip address 10.10.240.191 255.255.255.255
!
interface Loopback192
 description TunnelSRC-nat-{{IP-EXT-NAT-WWW2}}
 ip address 10.10.240.192 255.255.255.255
!
interface Tunnel191
 description 3G-ExtIP-{{IP-EXT-NAT-WWW1}}
 ip address 10.202.191.1 255.255.255.0
 no ip redirects
 ip nhrp group 191
 ip nhrp map multicast dynamic
 ip nhrp network-id 191
 ip ospf network broadcast
 ip ospf flood-reduction
 ip ospf priority 191
 tunnel source Loopback191
 tunnel mode gre multipoint
!
interface Tunnel192
 description 3G-ExtIP-{{IP-EXT-NAT-WWW2}}
 ip address 10.202.192.1 255.255.255.0
 no ip redirects
 ip nhrp group 192
 ip nhrp map multicast dynamic
 ip nhrp network-id 192
 ip ospf network broadcast
 ip ospf flood-reduction
 ip ospf priority 192
 tunnel source Loopback192
 tunnel mode gre multipoint
!
router ospf 1
 network 10.202.0.0 0.0.255.255 area 0
!

2013 - put cellular network interface in own vrf.

!
vrf definition vrf3gAPN
  rd 10.202.194.1:134
  !
  address-family ipv4
  exit-address-family
!
interface Tunnel194
  tunnel vrf vrf3gAPN
!
interface Cellular0/3/0
  vrf forwarding vrf3gAPN
!
no ip route           10.10.240.194 255.255.255.255 Cellular0/3/0 permanent name 3G-Central-APN-LB
ip route vrf vrf3gAPN 10.10.240.194 255.255.255.255 Cellular0/3/0 permanent name 3G-Central-APN-LB
!

IP SLA ping to force traffic on static route to bring-up Cellular to get IP to bring up Tunnel.

ip sla 191
!! Older routers #rtr  or #ip sla monitor !! 
  icmp-echo 10.10.240.191
  tag 3G-tun191
  frequency 600
ip sla schedule 193 life forever start-time now

Comments

Feel free to leave comments or corrections.
2013-01-21 Pieter Smit - chicken egg problem where tunnel down because no source IP on cellular, and cellular down due to no interesting traffic.
- Two solutions possible, [1.] Fix ip on cellular (works for private apn with fixed ip's) or [2.] ip sla to ping static route to force cellular0/3/0 up.
2012-10-20 Pieter Smit - Create page.

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