cancel
Showing results forĀ 
Search instead forĀ 
Did you mean:Ā 
cancel
393
Views
0
Helpful
2
Replies

ip routing traffic share question

Multiple routes exists to a destination (for example, default route), all routes are installed into RIB from EIGRP. How can I prefer route1 but start utilizing the other routes when route1 interface utilization gets very high?

If the traffic-share is unequal, what happens when the interface with high traffic share gets saturated? Do traffic automatically move to other routes or traffic still get sent strictly according to traffic share, causing the high share interface to drop traffic and other interfaces underutilized?

Is this a problem better solved with BGP full table? If BGP is not feasible, what options do I have? PfR can probably do it but I prefer a cleaner way ;)

2 Replies 2

Philip D'Ath
VIP Alumni
VIP Alumni

You said the answer.  Look at Pfr.

Joseph W. Doherty
Hall of Fame
Hall of Fame

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

Liability Disclaimer

In no event shall Author be liable for any damages wha2tsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.

Posting

How can I prefer route1 but start utilizing the other routes when route1 interface utilization gets very high?

PfR.

If the traffic-share is unequal, what happens when the interface with high traffic share gets saturated? Do traffic automatically move to other routes or traffic still get sent strictly according to traffic share, causing the high share interface to drop traffic and other interfaces underutilized?

Yup.

Is this a problem better solved with BGP full table?

Nope.  (Actually, although PfR can work with BGP, I once replaced full BGP tables with PfR - got better results - less load on the router.)

If BGP is not feasible, what options do I have?

PfR.  Or, your own script(s), doing what PfR does for you.

PfR can probably do it but I prefer a cleaner way ;)

If you do find a cleaner way, please post it!

You only mentioned dynamic interface load utilization routing, but PfR can do more!  For example, it can monitor performance to the destination, and shift traffic to obtain the best performance to the destination.