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Routing Protocols

  • Fast lookup of origin and neighbor ASs (MX480, MX960, MX10008, PTX1000, PTX10002, PTX10008, PTX10016, QFX10008, and vRR)—Starting in Junos OS Release 22.3R1, you can use the new asregex-optimize configuration statement at the [edit policy-options defaults] hierarchy level to perform a fast lookup of origin and neighbor autonomous systems (ASs). This optimization supports very large AS-Path regular expressions (typically as-path-group configuration) when the objective is to match neighboring ASes, or origin ASes.

    [See Improve the Performance of AS Path Lookup in BGP Policy.]

  • IS-IS flood optimization (MX960, MX2008, MX2010, MX2020, PTX10002, PTX10008, and PTX10016)—Starting in Junos OS Release 22.3R1, you can rate-limit the IS-IS label-switched paths (LSPs) that are retransmitted on parallel interfaces toward the same peer. This feature optimization prevents frequent drops in IS-IS hello protocol data units (PDUs) and subsequent adjacency reset. The optimizations also involve changes to the LSP transmission queues to avoid longer delays for frequently updated LSPs.

  • Strip and replace BGP private-AS path (ACX710, JRR200, MX480, PTX10001, QFX5220, and QFX10003)—In Junos OS Release 22.3R1, we have introduced the strip-as-path policy option that removes the incoming autonomous system (AS) path as part of the import policy for a BGP session and replaces the received autonomous system (AS) path with the receiving router's local AS number for the receiving session. Note that the local AS number may be different from the number configured under autonomous system in the [edit routing-options] hierarchy.

    If you need to normalize externally injected routes, you can use this policy option for the incoming autonomous system (AS) path so that it may be used similarly to routes that originate solely within the fabric. The new strip-as-path policy option has no impact on the BGP export policy.

    You can configure the strip-as-path option under policy-options then clause:

    set policy-options policy-statement do-strip term a then strip-as-path

    [See Autonomous Systems for BGP Sessions.]