Round-Robin Mode

Round-robin mode distributes packets equally among the available paths in the ECMP set.

ip multipath round-robin

• Use to specify round-robin as the mode for ECMP load sharing on an interface.
• ECMP uses the round-robin mode when you have configured all interfaces in the set to round-robin. Otherwise, ECMP defaults to hashed mode because round-robin mode can cause reordering of packets. You must explicitly ensure that the possible reordering is acceptable on all the member interfaces by setting them to round-robin mode.
• If one of the ECMP next hops is an indirect next hop, ECMP uses hashed mode load balancing.
• Example

  host1(config)#virtual-router router_0

  host1:router_0(config)#interface serial 4/0:1/22.22

  host1:router_0(config-subif)#ip multipath round-robin

  host1:router_0(config-subif)#exit

• Use the no version to set the ECMP mode to the default, hashed.
• See ip multipath round-robin

maximum-paths

• Use to control the maximum number of parallel routes that the routing protocol supports.
• The maximum number of routes can be in the range 1–16 for BGP, IS-IS, OSPF, or RIP.
• Example

  host1(config-router)#maximum-paths 2

• Use the no version to restore the default value, 1 for BGP or 4 for IS-IS, OSPF, or RIP.
• See maximum-paths

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