Multiple ISP WAN Load Balancing

[Hari_M]

Hi all,
I have a Cisco 3850 as my core switch with IP base license. Above that, Cisco 1921 router is there where one of my ISP terminated. I am going to add another ISP to my network. Now, I have to do LOAD BALANCING between WAN Link. I do not have Load Balancer in my setup. My requirement:

1. Is it possible to do WAN Link Load Balancing in 3850 using GLBP and PBR?

2. Will GLBP support in Cisco 3850 with IP base license or IP service License?

3. Is there any other alternate ways to achieve WAN load Balancing?

Both the ISP's are different. Multiple VLAN's are there in the network. Cisco 1921 has only one WAN link. The other new ISP have an ordinary home modem **bleep** router.

[Georg Pauwen]

Hello,

you need to run Cisco IOS XE Denali 16.x.x on your 3850 to have access to GLBP.

That said, you could also simply use two static default routes...e.g.:

ip route 0.0.0.0 0.0.0.0 GigbabitEthernet0/0 name ToISP1

ip route 0.0.0.0 0.0.0.0 GigbabitEthernet0/1 name ToISP2

[Joseph W. Doherty]

#3 (on 1921), might support PfR. For it to (dynamically) load balance, though, as your other router is not another ISR, it would need to have primary path egress link to other router. For redundancy, if the other router supported dual ingress, you could have a backup path from the 3850. (Unfortunately, this makes for a rather "messy" setup.)