IP Router Configuration
7705 SAR OS Router Configuration Guide 67
The following example displays a router advertisement configuration:
A:ALU-A>config>router>router-advert# info
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interface “n1”
prefix 3::/64
exit
no shutdown
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A:ALU-A>config>router>router-advert# interface n1
A:ALU-A>config>router>router-advert>if# prefix 3::/64
A:ALU-A>config>router>router-advert>if>prefix# into detail
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autonomous
on-link
preferred-lifetime 604800
valid-lifetime 2592000
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A:ALU-A>config>router>router-advert>if>prefix#
Configuring ECMP
ECMP (Equal-Cost Multipath Protocol) refers to the distribution of packets over two or more
outgoing links that share the same routing cost. The 7705 SAR load-balances traffic over
multiple equal-cost links with a hashing algorithm that uses header fields from incoming
packets to calculate which link to use. By adding additional fields to the algorithm, you can
increase the randomness of the results and ensure a more even distribution of packets across
available links. ECMP is supported on static routes and dynamic (OSPF, IS-IS, and BGP)
routes. The 7705 SAR supports ECMP for LDP and IP traffic.
If multiple routes are learned with an identical preference using the same protocol, the
lowest-cost route is used. If multiple routes are learned with an identical preference using the
same protocol and the costs (metrics) are equal, the decision of which route to use is
determined by the configuration of ECMP in the config>router context.
Use the following CLI syntax to configure ECMP, enable it and specify the maximum
number of routes to be used for route sharing (up to 8):
CLI Syntax: config>router
ecmp max-ecmp-routes
Example: config>router# ecmp 7
config>router# exit
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