08-04-2023 12:00 AM - edited 08-07-2023 01:49 AM
hello !
There are two ISPs. ISP-1 is the main route and ISP-2 is the backup path.(ISP - Router all eBGP)
Only Static Routing is available, and there are no other options.
I'm trying to use Floating Static Route to set the main route and backup route, but I'm asking if it's possible.
If these methods are not possible, are there any other alternatives?
- Router-1
ip route 0.0.0.0 0.0.0.0 100.100.100.1 (ISP-1 main)
ip route 0.0.0.0 0.0.0.0 200.200.200.1 20 (ISP-2 backup)
- Router-2
ip route 0.0.0.0 0.0.0.0 100.100.100.1 (ISP-1 main)
ip route 0.0.0.0 0.0.0.0 200.200.200.1 20 (ISP-2 backup)
Best regards,
Solved! Go to Solution.
08-04-2023 01:00 AM - last edited on 08-06-2023 08:47 PM by Translator
Hello @goyourmin,
sorry I don't understant and I need more clarification.
- Router-1
ip route 0.0.0.0 0.0.0.0 100.100.100.1 (ISP-1 main) ----- [1]
ip route 0.0.0.0 0.0.0.0 200.200.200.1 20 (ISP-2 backup) ----- [2]
How Router-1 should have IP ROUTE [2] because the next-hop 200.200.200.1 is not in its side!
It should be ip route 0.0.0.0 0.0.0.0 172.16.0.X 20 (ISP-2 backup towards Router-2)
Then on Router-1:
- Router-1
ip route 0.0.0.0 0.0.0.0 100.100.100.1 (ISP-1 main)
ip route 0.0.0.0 0.0.0.0 172.16.0.X 20 20 (ISP-2 backup)
And as concerned Router-2:
- Router-2
ip route 0.0.0.0 0.0.0.0 176.16.0.Y (ISP-1 main towards Router-1)
ip route 0.0.0.0 0.0.0.0 200.200.200.1 20 (ISP-2 backup)
-- You could add ipsla also to force the backup route if MAIN ISP is down.
08-04-2023 01:38 AM
M02@rt37 you would require IPSLA however given the topology presented it would be very adminstrative, best way would to introduce some dynamic routing
08-04-2023 01:00 AM - last edited on 08-06-2023 08:47 PM by Translator
Hello @goyourmin,
sorry I don't understant and I need more clarification.
- Router-1
ip route 0.0.0.0 0.0.0.0 100.100.100.1 (ISP-1 main) ----- [1]
ip route 0.0.0.0 0.0.0.0 200.200.200.1 20 (ISP-2 backup) ----- [2]
How Router-1 should have IP ROUTE [2] because the next-hop 200.200.200.1 is not in its side!
It should be ip route 0.0.0.0 0.0.0.0 172.16.0.X 20 (ISP-2 backup towards Router-2)
Then on Router-1:
- Router-1
ip route 0.0.0.0 0.0.0.0 100.100.100.1 (ISP-1 main)
ip route 0.0.0.0 0.0.0.0 172.16.0.X 20 20 (ISP-2 backup)
And as concerned Router-2:
- Router-2
ip route 0.0.0.0 0.0.0.0 176.16.0.Y (ISP-1 main towards Router-1)
ip route 0.0.0.0 0.0.0.0 200.200.200.1 20 (ISP-2 backup)
-- You could add ipsla also to force the backup route if MAIN ISP is down.
08-04-2023 01:38 AM
M02@rt37 you would require IPSLA however given the topology presented it would be very adminstrative, best way would to introduce some dynamic routing
08-04-2023 01:50 AM
Fore sure @paul driver., but "Only Static Routing is available, and there are no other options."
08-04-2023 02:00 AM
I'm sorry. Currently, dynamic routing configuration is not possible for a number of reasons.
08-04-2023 02:00 AM - last edited on 08-06-2023 08:48 PM by Translator
I wondered if that was possible. now I understand that the static route is only available for
next-hops
Eventually, if ISP-1 fails, I understood that the usual thing I could do was to change the static configuration settings myself.
- Router-1 (Router-1 E0/0 172.16.0.1/30)
ip route 0.0.0.0 0.0.0.0 100.100.100.1 (ISP-1 main)
ip route 0.0.0.0 0.0.0.0 172.16.0.2 20 (ISP-2 backup)
- Router-2 (Router-2 E0/0 172.16.0.2/30)
ip route 0.0.0.0 0.0.0.0 176.16.0.1 (ISP-1 main towards Router-1)
ip route 0.0.0.0 0.0.0.0 200.200.200.1 20 (ISP-2 backup)hops.
08-04-2023 02:45 AM
08-04-2023 01:13 AM - last edited on 08-06-2023 08:52 PM by Translator
Hello
Incorporating
iplsa
and object tracking would work for you regards the default statics, However looking at your topology are you not receiving a default from the upstream ISPs?
Do you have IBGP between
rtr 1-2
if so it would be best to introduce some dynamic routing between your wan
rtrs
and the L3 switches (OSPF), and then advertise a default from the wan
rtrs
into your LAN with metrics, (the lower value best preferred) this will provide a more resilient, deterministic and dynamic failover?
08-04-2023 02:02 AM
It is assumed that ISP-1, 2 are different companies and communicate with each other via eBGP. In fact, even in the configuration, Router-1,2 and ISP companies work together with eBGP.
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