
Configuring IP, ARP, RARP, RIP, and OSPF Services
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308627-14.20 Rev 00
Using Site Manager
To disable or reenable support for route filters, complete the following tasks:
Configuring Equal-Cost Multipath Support for RIP and OSPF
IP features equal-cost multipath (ECMP) support to distribute traffic over multiple
equal-cost paths (up to 12) to the same destination. By default, the maximum
number of equal-cost paths is 1; that is, the IP routing table stores a single best
route to each known destination, and ECMP support is disabled.
IP supports three methods of distribution for equal-cost routes:
• Round-robin distribution. IP forwards each packet to a different next hop until
it reaches the end of the list of available next hops; then it repeats the list.
Round-robin distribution attempts to make full use of available resources but
may cause packets to be delivered out of order.
• Source-destination hash distribution based on the source and destination
address. IP forwards all packets with a given source and destination address to
the same next hop. This method increases the chances that the packets will be
delivered in order.
• Destination-hash distribution based on the destination address only. IP
forwards all packets with a given destination address to the same next hop.
Site Manager Procedure
You do this System responds
1. In the Configuration Manager window,
choose Protocols.
The Protocols menu opens.
2. Choose IP. The IP menu opens.
3. Choose Global. The Edit IP Global Parameters window
opens.
4. Set the Route Filter Support parameter.
Click on Help or see the parameter
description on page A-24.
5. Click on OK. You return to the Configuration Manager
window.
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