default routing issue

[wasahongNYC]

hello everyone,

please help me out when you get a chance.

in the diagram,

for ISP A and ISP B failover, eBGP.

for Router_1 G0/1 and Router_2 G0/1 interfaces : HSRP

for Router_1 G0/2 and Router_2 G0/2 interfaces : HSRP

for ASA_1 G0/1 and ASA_2 G0/1 interfaces : HSRP

for ASA_1 G0/2 and ASA_2 G0/2 interfaces : HSRP

and,

if Main_1 goes down,

then for inbound traffic,

say I want the traffic goes by this path,

Router_1 -> Main_2 -> ASA_1,

Can I accomplish this by IPSLA ?

( follow this article, https://supportforums.cisco.com/docs/DOC-6078 )

or accomplishing this by switch is better ?

please give me some recommendations if it is possible.

I really appreciate your help.

Thanks,

[Abzal]

Hi,

You could achieve it with HSRP, IP SLA and BGP as-path prepend.

1. But Router_1 and Router_2 interfaces connected to Main_1 need to be on the same VLAN and subnet. Also this is correct for Main_2. And for both ASAs.

2. For Internet failover you could use IP SLA icmp-echo tracking object. Then use it in HSRP for routers.

3. If ISP_B it is used as backup you could do AS-PATH prepend on Router_2 to make ISP_B inbound traffic less preferable.

4. For ASAs you could use active/passive failover.

http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_configuration_example09186a00807dac5f.shtml#lanbas

Hope it will help.

Best regards,
Abzal