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Pix OSPF load balancing question

jbrunner007
Level 1
Level 1

I have a pix 515e with two default routes, learned via OSPF from two routers on the "outside" interface.

Currently router#2 is being preferred way much more than router#1. There are many thousands of destinations for the traffic. These two routers are further doing NAT to nat rfc1918 ip's to the internet (the pix is NOT doing nat)

Can someone please let me know how the PIX does load balancing? is it by IP address destination? is it something else?

thanks,

Joe

1 Accepted Solution

Accepted Solutions

mlitka
Level 2
Level 2

Per TAC:

"the PIX will do per-destination Load Balancing instead of per packet

load balancing. The algorithm will look at the source and destination

addresses. It does not do 1:1 load balancing. Given enough different

source and destination addresses, the packets will more or less reach a

50/50 spit between the two next-hops. However, in real world testing

with the same source and destination addresses, it may not reach an even

load balancing."

View solution in original post

2 Replies 2

cpembleton
Level 4
Level 4

The pix does not do load balancing. Your only option would be to configure the upstream routers to load balance.

Thanks,

Chad

mlitka
Level 2
Level 2

Per TAC:

"the PIX will do per-destination Load Balancing instead of per packet

load balancing. The algorithm will look at the source and destination

addresses. It does not do 1:1 load balancing. Given enough different

source and destination addresses, the packets will more or less reach a

50/50 spit between the two next-hops. However, in real world testing

with the same source and destination addresses, it may not reach an even

load balancing."

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