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New and Changed Features

This section describes the new features and enhancements to existing features in Junos OS Release 15.1F2 for the PTX Series.

Class of Service (CoS)

  • Change in scaling number for rewrite rules (PTX Series)—Starting with Release 15.1F2, on PTX Series routers, the scaling number for a rewrite rule is reduced by one when the default EXP rewrite is used. This change in scaling number is introduced to:
    • Support all possible combinations of EXP rewrite rules.
    • Fix the issue of incorrect modification of EXP bits of the inner label by the default MPLS EXP rewrite rule during the label pop operation.


  • SAFI 129 NLRI compliance with RFC 6514 (PTX Series)—Starting with Junos OS Release 15.1F2, the Network Layer Reachability Information (NLRI) format available for BGP VPN multicast is changing from the de facto format of Subsequent Address Family Identifier (SAFI) 128 to Subsequent Address Family Identifier (SAFI) 129 as defined in RFC 6514. SAFI 128 uses length, label, prefix. SAFI 129 uses length, prefix.

    To use SAFI 129, enable the rfc6514-compliant-safi129 statement at any of the following hierarchy levels: [edit protocols bgp], [edit protocols bgp group group-name], or [edit protocols bgp group group-name neighbor address].


  • Flow-aware transport pseudowire for BGP L2VPN and BGP VPLS (PTX Series)— Starting with Junos OS Release 15.1F2, the flow-aware transport (FAT) label that is supported for BGP-signaled pseudowires such as L2VPN and VPLS is configured only on the label edge routers (LERs). This causes the transit routers or label-switching routers(LSRs) to perform load balancing of MPLS packets across equal-cost multipath (ECMP) paths or link aggregation groups (LAGs) without the need for deep packet inspection of the payload. The FAT flow label can be used for LDP-signaled forwarding equivalence class (FEC 128 and FEC 129) pseudowires for VPWS and VPLS pseudowires.

Related Documentation

Modified: 2017-07-06