mac-lookup-length
Syntax
mac-lookup-length number-of-entries;
Hierarchy Level
[edit ethernet-switching-options]
Description
Increase the maximum number of searchable hash indexes to mitigate situations in which hash index collisions are causing problems with the learning of MAC addresses in the forwarding database (FDB).
The FDB on EX3200, EX3300, EX4200, EX4500, EX4550, and EX6210 switches is a hash table with 8192 hash indexes (rows) of MAC addresses and four entries per hash index. When the FDB is searched, a configured hash function calculates the hash index at which to start the search. By default, after the search starts at the determined hash index, the maximum number of hash indexes that can be searched is one hash index, or four entries
Increasing the number of hash indexes increases the chances of finding an open entry in which to add a newly learned MAC address. However, searching more hash indexes requires more bandwidth and may impact the FDB performance and line-rate traffic.
Default
4
Options
number-of-entries—Maximum number of searchable hash indexes in the FDB.
Range:
4,8,12
Required Privilege Level
system—To view this statement in the configuration.system-control—To add this statement to the configuration.
Release Information
Statement introduced in Junos OS Release 11.4.