06-15-2009 02:38 PM - edited 03-04-2019 05:08 AM
Hi,
We have 2x separate ISP, one is use for Primary and the other is Backup. I'm using a Cisco 3825 with 3 Ethernet ports.
Configure using floating static with the backup set to 50 metric distance and route-maps for NAT between the two ISP networks.
ip route 0.0.0.0 0.0.0.0 ISP1 name DEFAULT-ROUTE-ISP
ip route 0.0.0.0 0.0.0.0 ISP2 50 name SECONDARY-DEFAULT-ROUTE-ISP
!
route-map NAT-to-ISP2 permit 10
match ip address NAT_ACL
match interface GigabitEthernet0/1
!
route-map NAT-to-ISP1 permit 10
match ip address NAT_ACL
match interface GigabitEthernet0/0
The problem I recently experience is with Ethernet WAN service, ISP will provide a switch (usually a Cisco switch) to connect our WAN port too. From the ISP towards the WAN there is a fibre link going to the ISP network and if for some reason an outage occurs within the ISP network, the WAN link stays up due to CE to PE connection still active. Physical and protocol stays up on the CE route but next hop IP address is no longer reachable.
I actually found this solution:
http://www.cisco.com/en/US/tech/tk364/technologies_configuration_example09186a0080211f5c.shtml
Policy Based Routing with the Multiple Tracking Options
The only problem is I'm not running the correct IOS version ((C3825-ADVSECURITYK9-M), Version 12.4(7g)). Does anyone know of alternate solution similar to tracking?
Thanks
Solved! Go to Solution.
06-15-2009 03:19 PM
Per the link you posted
"This feature was introduced in Cisco IOS® Software Release 12.3(4)T"
12.4 Mainline will definitely have PBR with Tracking options. The IP SLA commands may be a little different, follow the 12.4 Mainline doc:
http://www.cisco.com/en/US/docs/ios/12_4/ip_sla/configuration/guide/hsla_c.html
HTH,
__
Edison
06-15-2009 03:19 PM
Per the link you posted
"This feature was introduced in Cisco IOS® Software Release 12.3(4)T"
12.4 Mainline will definitely have PBR with Tracking options. The IP SLA commands may be a little different, follow the 12.4 Mainline doc:
http://www.cisco.com/en/US/docs/ios/12_4/ip_sla/configuration/guide/hsla_c.html
HTH,
__
Edison
06-15-2009 05:54 PM
Thanks Edison,
IP SLA with track works perfect for me.
Layer 3 down but physical and L2 is still up, the backup activates as the gateway last resort.
Cheers
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: