
Configuring and Customizing IP for BGP
308628-14.00 Rev 00
4-5
For example, the following command puts the router in forwarding mode:
ip# forwarding forwarding
ip#
Using Site Manager
Enabling Equal-Cost Multipath Support
By default, IP stores the best next hop to a destination in the routing table. If
traffic arrives on an interface, IP determines the best route to the destination and
forwards all packets out the next-hop interface.
IP equal-cost multipath support (ECMP) is a load-balancing feature that allows IP
to distribute traffic over multiple (up to five) equal-cost paths to the same
destination.
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 makes 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.
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
Forwarding
parameter. Click on
Help
or see the parameter description on
page A-44
.
5. Click on
OK
. Site Manager returns you to the
Configuration Manager window.
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