Active/Active ECMP

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Active/Active ECMP

L3 Networker

I have two Palo Alto 5250s running in my core network as a core firewall for all campus and datacetner traffic. They are running active/active. I have layer 3 routing south bound to two cat9500s not in VSS. So I am running HSRP on each 9500 alternating vlans to utilize them both. All 4 units are running OSPF to advertise loopbacks and iBGP is used to carry routes. The 9500s are setup for ECMP and so are the Palo Altos. I feel like there is some weird traffic issues with this, Should the Palo Altos even be setup with ECMP? If so should I be using the symetrical return option? Would having ECMP on the Cat9500s be enough to achieve load sharing/balancing over each layer 3 link to each Palo Alto? Each cat 9500 has a layer 3 link to each Palo Alto. And yes before people tell me Active/Active is not a good idea I cant see why not when my network is symetrical. 

23 REPLIES 23

ECMP should still work as long as you remove HSRP regardless of router ID for "Equal Cost Paths" only.

Not running active/active for increase performance because I know you get maybe 20% on that. I am using it because I have two active core switches and it becomes a load share game. Do ditch HSRP and use what for LAN side? thats the real challenge. 

 

 

MC-LAG?  Not sure the new 9500s support that.  Are you avoiding stacking them for any specific reason?

Cat9500s not stacked, no VSS, no Nexus core running active/active HSRP. So doesnt qualify. 

Now, I am fantasizing here, but I thought about running HSRP egress side to the palos and running palos with floating IP (essentially vrrp)....

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