Default route failover between two cellular interfaces

[Ji-Won Park]

Hello all,

I have to deploy a router with two WICs, one's using 3G (HSPA+) network, and another one's using LTE network.

Here is the scenarios I thought about:

cellular 0/0/0 is LTE, cellular 0/1/0 is 3G

---Failover between two interfaces---

ip route 0.0.0.0 0.0.0.0 cellular0/0/0 1

ip route 0.0.0.0 0.0.0.0 cellular0/1/0 10

---Failover using ip sla---

Ip sla 100

icmp-echo 8.8.8.8 source-interface cellular0/0/0

frequency 10

Ip sla schedule 100 life forever start-time now

Track 1 rtr 100 reachability

ip route 0.0.0.0 0.0.0.0 cellular0/0/0 1 track 1

ip route 0.0.0.0 0.0.0.0 cellular0/1/0 10 name 3G_Backup

----------------------------------------

Which one's a better way of doing this? Would both solutions work? I thought about using ip sla in case the interface stays up.

Your idea would be much appreciated.

Thanks.

JP

[John Blakley · Accepted solution]

JP,

Either of these should work, and the sla would be better if the interface stays in an up/up state but doesn't pass traffic for whatever reason. I would go with the sla route to cover both scenarios (interface is up/up but not passing traffic OR interface is completely down).

HTH,
John

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[Ji-Won Park]

Thanks John. I wanted to verify it with someone