Load Balance 2 ISP with Cisco
- Dedicate one ISP between two by the destination TCP/UDP port number
- OER on Routers (without BGP; just static routes)
- Redundant Link Graceful Internet Load Balance/Failover
- IP SLA Load Balance – Sample Configuration and Workaround
http://www.dslreports.com/faq/13355
Below is a full working sample configuration based on the thread:
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version 12.4service timestamps debug datetime localtimeservice timestamps log datetime localtimeservice password-encryption!!resource policy!ip subnet-zero!!!!ip cefvpdn enable!!clns routing!!!key chain cisco0 key 1 key-string 7 *******!!!!!!!!!!!!oer master policy-rules OER max-range-utilization percent 10 keepalive 1 ! border 192.168.20.1 key-chain cisco0 interface FastEthernet0/0.21 internal interface FastEthernet0/0.22 internal interface Ethernet1/0 external interface Ethernet1/1 external ! learn throughput delay periodic-interval 1 monitor-period 2 prefixes 200 expire after time 1 aggregation-type prefix-length 32 max prefix total 2500 backoff 180 360 mode route control mode select-exit best periodic 180 resolve loss priority 1 variance 1 resolve delay priority 2 variance 1 resolve utilization priority 3 variance 1 resolve range priority 5!oer border local Loopback0 active-probe address source interface Ethernet1/0 master 192.168.20.1 key-chain cisco0!!!!!!!bba-group pppoe global!!interface Loopback0 description OER Master Controller ip address 192.168.20.1 255.255.255.255!interface FastEthernet0/0 description To L2 Switch port 15 no ip address duplex auto speed auto!interface FastEthernet0/0.1 description Native VLAN Trunking encapsulation dot1Q 1 native ip address 192.168.205.1 255.255.255.248!interface FastEthernet0/0.21 description To Switch A port 10 encapsulation dot1Q 21 ip address 192.168.21.1 255.255.255.252 ip nat inside ip virtual-reassembly!interface FastEthernet0/0.22 description To Switch B port 2 encapsulation dot1Q 22 ip address 192.168.22.1 255.255.255.252 ip nat inside ip virtual-reassembly!!interface Ethernet1/0 description To NAT box of ISP #1 ip address 172.16.0.2 255.255.255.252 full-duplex!interface Ethernet1/1 description To NAT box of ISP #2 ip address 172.16.0.6 255.255.255.252 ip virtual-reassembly full-duplex!interface Ethernet1/2 no ip address shutdown half-duplex!interface Ethernet1/3 no ip address shutdown half-duplex!!!!ip classlessip route 0.0.0.0 0.0.0.0 172.16.0.1ip route 0.0.0.0 0.0.0.0 172.16.0.5!!no ip http serverno ip http secure-server!ip prefix-list OER seq 10 permit 0.0.0.0/0!access-list 20 remark Approved IP addressesaccess-list 20 permit 10.0.0.0 0.255.255.255access-list 20 permit 172.16.0.0 0.15.255.255access-list 20 permit 192.168.0.0 0.0.255.255dialer-list 2 protocol ip permitno cdp run!!!oer-map OER 10 match ip address prefix-list OER!control-plane!!!line con 0line aux 0line vty 0 4 access-class 20 in password 7 ****** login!!end |
