Hello Frenando,
I will take some assumptions to address your query but i hope that u will get the Idea....
if your proxy servers are connected to a device (i will assume a L3 Switch), you can apply PBR and IP SLA ICMP Echo Operation to track the path through the individual routers, this way you can track the routers as well as the internet connectivity also. Here's how u do it...
configure these routes on the switches:-
ip route 4.2.2.2 255.255.255.255
ip route 4.2.2.1 255.255.255.255
the configure the IP-SLA ICMP Echo Operation as follows
=============================================
ip sla 1
icmp-echo 4.2.2.2 !Ping through Router 1
timeout 2500
frequency 3
exit
track 1 ip sla 1 reachability
OR
track 1 rtr 1 reachablity
delay down 10
exit
ip sla schedule 1 life forever start-time now
=============================================
ip sla 2
icmp-echo 4.2.2.1 !Ping through Router 2
timeout 2500
frequency 3
exit
track 2 ip sla 2 reachability
OR
track 2 rtr 2 reachablity
delay down 10
exit
ip sla schedule 2 life forever start-time now
=============================================
configure two ACL's to match the IP Addresses of the Two Proxy Servers e.g.
access-list 101 permit ip any
access-list 102 permit ip any
you can configure specific port numbers e.g. http, ftp, smtp etc to be more specific as to what traffic you would send to internet...
Now configure PBR as usual but with the following next-hop config:
class-map One
match ip address 101
class-map Two
match ip address 102
policy-map PBR
class One
set ip next-hop verify-availability track 1
set ip next-hop verify-availability track 2
class Two
set ip next-hop verify-availability track 2
set ip next-hop verify-availability track 1
interface vlan
ip policy route-map PBR
IP SLA ICMP Echo Operation will poll or ping both the routers and the one which is up will be used...if your proxy servers are on different Vlans the apply one policy per Vlan..You would require Advance IP Services for the IP SLA feature..
Hope this Helps
and Rate if Helpful :-)
Regards
Rohit
