GGSN的配置是思科路由器配置过程中重要的部分，具体要进行哪些操作步骤呢？请看下面这篇文章。
version 12.0
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
service gprs ggsn
!
hostname c7206-4
!
aaa new-model
aaa authentication ppp default radius
aaa authorization network default radius
enable password mypass
!
ip subnet-zero
ip domain-name gprs.com
ip name-server 99.100.0.2
ip dhcp excluded-address 60.0.0.1
!
! local IP address pool
ip dhcp pool 1
network 60.0.0.0 255.255.255.0
!
ip address-pool dhcp-proxy-client
ip dhcp-server 60.0.0.1
ip dhcp-server 99.100.0.3
!
interface Loopback0
ip address 60.0.0.1 255.0.0.0
no ip directed-broadcast
no ip route-cache
no ip mroute-cache
!
interface Tunnel0
ip address 97.0.0.1 255.0.0.0
no ip directed-broadcast
ip mtu 1476
tunnel source 4.0.0.1
tunnel destination 131.108.164.19
!
! Interface to communicate with Virtual Template on SGSN
interface FastEthernet0/0
ip address 35.0.0.2 255.0.0.0
ip helper-address 99.100.0.3
no ip directed-broadcast
no ip route-cache
no ip mroute-cache
no keepalive
!
! interface to communicate with the PDN
interface FastEthernet1/0
ip address 4.0.0.1 255.0.0.0
no ip directed-broadcast
no ip route-cache
no ip mroute-cache
!
! Interface to TFTP server
interface Ethernet2/0
ip address 99.102.0.54 255.255.0.0
no ip directed-broadcast
no ip route-cache
no ip mroute-cache
!
!
! Virtual Template configuration
interface virtual-template 1
ip address 10.10.10.1 255.255.255.0
no ip directed-broadcast
encapsulation gtp
gprs access-point-list abc
ip classless
!
! Route for the virtual template on the SGSN
ip route 1.1.1.1 255.255.255.255 FastEthernet0/0
access-list 101 deny ip host 4.0.0.2 host 2.0.0.1
dialer-list 1 protocol ip permit
snmp-server community public RW
!
!
! Global DHCP server, charging server, and RADIUS server information
gprs default dhcp-server 99.100.0.3
gprs default charging-gateway 99.100.0.3 99.100.0.2
gprs charging server-switch-timer 0
!
radius-server host 99.100.0.2 auth-port 1645 acct-port 1646
radius-server key mykey
!
!
! access-point list configuration
! access point for access to PDN
gprs access-point-list abc
access-point 1
access-point-name gprs.company.com
dhcp-server 99.100.0.3
exit
!
!access point for access to a private network
access-point 2
access-point-name xyz.com
dhcp-server 60.0.0.1
dhcp-gateway-address 60.0.0.1
use-interface Tunnel0 next-hop-address 97.0.0.21
exit
!
! access point for access to PDN
access-point 3
access-point-name www.gprs_mycompany
access-mode non-transparent
radius-server 99.100.0.2
exit
!
line con 0
exec-timeout 0 0
transport input none
line aux 0
exec-timeout 0 0
transport input all
line vty 0 4
exec-timeout 0 0
password mypass
!
end
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