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Primary backup mode ISP internet links (ILL, PPPOE) configuration using IP SLA monitor
I am posting an article for circuit redundancy used in working scenario.
Router is Cisco 1841 with IOS image c1841-spservicesk9-mz.124-15.T12.bin.
Router has three Fast Ethernet interfaces, each one for ISP1, ISP2 and customer LAN.
Router is connected with two Internet circuits.
Primary as internet lease line (ILL) with static IP and Tunnel config and NATed with IP POOL connected to ISP1.
Backup as PPPOE broadband with dynamic IP address connected to ISP2.
Router#sh run Building configuration...
Current configuration : 2653 bytes ! version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname Router ! boot-start-marker boot-end-marker ! enable password XXXXXXX ! no aaa new-model dot11 syslog ip cef ! ! no ip dhcp use vrf connected ip dhcp excluded-address 192.168.1.1 ip dhcp excluded-address 192.168.1.X ! ip dhcp pool Customer_LAN network 192.168.1.0 255.255.255.0 default-router 192.168.1.1 dns-server 218.248.x.x 203.124.16.x.x lease 2 ! ! ip name-server 203.124.x.x ip name-server 218.248.x.x multilink bundle-name authenticated vpdn enable ! vpdn-group 1 request-dialin protocol pppoe l2tp tunnel receive-window 1024 ! ! ! ! archive log config hidekeys ! ! ! track 1 rtr 1 reachability ! ! bba-group pppoe global ! ! interface Tunnel1 description ISP1 - Tunnel ip address 10.x.x.4 255.255.255.252 ip nat outside ip virtual-reassembly tunnel source 71.x.x.2 tunnel destination 71.x.x.10 ! interface FastEthernet0/0
description ISP1 - Internet lease line ip address 71.x.x.2 255.255.255.0 duplex auto speed auto ! interface FastEthernet0/1 description ISP2 DSL interface for Internet no ip address ip virtual-reassembly duplex auto speed auto pppoe enable group global pppoe-client dial-pool-number 1 ! interface FastEthernet0/0/0
description Customer LAN ip address 110.x.x.205 255.255.255.0 secondary ip address 192.168.1.1 255.255.255.0 ip nat inside ip virtual-reassembly duplex auto speed auto ! interface Dialer1 ip address negotiated ip mtu 1492 ip nat outside ip virtual-reassembly encapsulation ppp dialer pool 1 dialer-group 1 no cdp enable ppp authentication chap callin ppp chap hostname xxxxxxx (username given by ISP) ppp chap password 0 xxxxxxxxx (Password given by ISP)
! ip forward-protocol nd ip route 0.0.0.0 0.0.0.0 Tunnel1 track 1 ip route 18.104.22.168 255.0.0.0 71.x.x.1 track 1 ip route 0.0.0.0 0.0.0.0 Dialer1 200 ! ! ip http server no ip http secure-server ip nat pool ISP1-Pool 110.x.x.205 110.x.x.205 netmask 255.255.255.0 ip nat inside source route-map ISP1-NAT pool ISP1-Pool overload
ip nat inside source route-map ISP2-NAT interface Dialer1 overload ! ip sla 1 icmp-echo 71.x.x.1 source-interface FastEthernet0/0 timeout 1000 threshold 40 frequency 3 ip sla schedule 1 life forever start-time now
! access-list 1 permit 192.168.1.0 0.0.0.255
! no cdp run
! route-map ISP1-NAT permit 10 match ip address 1 set interface FastEthernet0/0 ! route-map ISP2-NAT permit 10 match ip address 1 match interface Dialer1 ! ! ! ! control-plane ! ! ! line con 0 line aux 0 line vty 0 4 password XXXXXX login ! scheduler allocate 20000 1000 end
Router#sh ver Cisco IOS Software, 1841 Software (C1841-SPSERVICESK9-M), Version 12.4(15)T12, RELEASE SOFTWARE (fc3) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2010 by Cisco Systems, Inc. Compiled Fri 22-Jan-10 00:40 by prod_rel_team
ROM: System Bootstrap, Version 12.4(13r)T, RELEASE SOFTWARE (fc1)
Router uptime is 17 hours, 21 minutes System returned to ROM by reload at 11:24:31 UTC Mon Oct 11 2010 System image file is "flash:c1841-spservicesk9-mz.124-15.T12.bin"
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Cisco 1841 (revision 7.0) with 235520K/26624K bytes of memory. Processor board ID FHKXXXXXXXX 3 FastEthernet interfaces DRAM configuration is 64 bits wide with parity disabled. 191K bytes of NVRAM. 62720K bytes of ATA CompactFlash (Read/Write)