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New Features in Junos OS Release 12.3X50-D45 for the QFX Series

Layer 3 Protocols

  • When members are added to or deleted from an equal cost multipath (ECMP) member list, Junos OS creates a new ECMP next hop in a make-before-break fashion, meaning that the new next hop is installed before the route change and deletion of the previous next hop. Junos OS 12.3X50-D45 enhances this process so that when a route changes to point to a new ECMP next hop that has a different member list but the identical member count as the previous next hop, Junos OS keeps the members in the same locations in the new member list as in the previous member list, and no rehashing is performed. (If routes pointing to the new ECMP next hop are added while the next hop is being installed, then rehashing is performed. Also, if the member count is not identical, then rehashing is performed even if some members are retained.)

Related Documentation

Modified: 2015-04-10