Configuring The Speed; Configuring Equal-Cost Multipath Load Sharing; Defining Maximum Paths; Round-Robin Mode - Juniper IGP - CONFIGURATION GUIDE V11.1.X Configuration Manual

Configuring the Speed

The router enables you to set the speed of an IP interface.
ip speed

Configuring Equal-Cost Multipath Load Sharing

Equal-cost multipath (ECMP) sets are formed when the router finds routing table
entries for the same destination with equal cost. The router then balances traffic
across these sets of equal-cost paths by using one of two ECMP modes hashed (the
default) or round-robin.
Hashed mode uses hashing of source and destination addresses to determine which
of the available paths in the ECMP set to use. Hashed mode is the default ECMP mode
of operation.

Defining Maximum Paths

You can add routing table entries manually (as static routes), or they are formed as
routers discover their neighbors and exchange routing tables (via OSPF, BGP, and
other routing protocols).
The maximum paths command controls the maximum number of parallel routes
that the routing protocol (BGP, IS-IS, OSPF, or RIP) can support.

Round-Robin Mode

Round-robin mode distributes packets equally among the available paths in the ECMP
set.
If all the ECMP links are configured for the ip multipath round-robin command and
their next hops are direct next hops, the round-robin mode uses the random algorithm
for traffic distribution.
In round-robin mode, if a packet uses a path, the next packet can choose the same
path or the previous path, or the next path based on the random value generated.
Use the no version to disable link status traps on an interface.
See snmp trap ip link-status
Use to set the speed of the interface in bits per second.
By default, the speed is determined from a lower-layer interface.
Example
host1(config-if)#ip speed 1000
Use the no version to set the speed to the default, 0.
See ip speed
Chapter 1: Configuring IP
49
IP Routing