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Load balancing on 2900 series

lcaruso
Frequent Contributor
Frequent Contributor

Hi,

For a 2900 connected to two ISP's, how can I load balance traffic from an inside ASA to the ISP's so that traffic is more or less evenly distributed and also failover is taken care of if one ISP goes down.

Thanks.

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paolo bevilacqua
Hall of Fame Master Hall of Fame Master
Hall of Fame Master
3 REPLIES 3

paolo bevilacqua
Hall of Fame Master Hall of Fame Master
Hall of Fame Master

Hi I tried this scenario in GNS3. Its does not work as mentioned in that link.

All wise the Inside traffic is getting nated to 1st ISP link only. If I shutdown that 1st ISP link then Inside traffic is getting nated to 2nd ISP link. How I can make effectively load balances between those links.

R2#sh ip nat translations

Pro Inside global      Inside local       Outside local      Outside global

icmp 120.240.129.1:9   192.168.10.2:9     4.2.2.2:9          4.2.2.2:9

icmp 120.240.129.1:7   192.168.20.1:7     4.2.2.2:7          4.2.2.2:7

tcp 120.240.129..1:44553 192.168.10.2:44553 4.2.2.2:23       4.2.2.2:23

R2#

R2#sh ip route static

S*   0.0.0.0/0 [1/0] via 120.240.129.2

                       [1/0] via 58.159.199.2

R2#

R2#sh run | s nat

ip nat inside

ip nat inside

ip nat outside

ip nat outside

ip nat inside source route-map Tesing_F0/0 interface FastEthernet0/0 overload

ip nat inside source route-map Tesing_S0/0 interface Serial0/0 overload

R2#

R2#sh run | s permit

access-list 10 permit any

route-map Tesing_S0/0 permit 10

match ip address 10

match interface Serial0/0

route-map Tesing_F0/0 permit 10

match ip address 10

match interface FastEthernet0/0

R2#

R2#sh ver | i IOS

Cisco IOS Software, 2600 Software (C2691-ADVENTERPRISEK9-M), Version 12.4(25c), RELEASE SOFTWARE (fc2)

R2#

Hi When I instate traffic from inside to outside with different destination ip address at that time load balancing is happening between 2 ISP .

R2#
R2#clear ip nat translation *
R2#
R2#
R2#sh ip nat translations

R2#
R2#sh ip nat translations
Pro Inside global      Inside local       Outside local      Outside global
tcp 120.240.129.1:28541 192.168.10.2:28541 1.1.1.1:23        1.1.1.1:23
R2#
R2#sh ip nat translations
Pro Inside global      Inside local       Outside local      Outside global
tcp 120.240.129.1:28541 192.168.10.2:28541 1.1.1.1:23        1.1.1.1:23
tcp 58.159.199.1:58981 192.168.10.2:58981 4.2.2.2:23         4.2.2.2:23
R2#
R2#

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