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What’s Changed in Release 21.4R2

General Routing

  • Stateful port configuration for PTP over Ethernet and default profile is supported only on boundary clock mode and not on ordinary clock mode.

  • OpenConfig container names for Point-to-Multipoint per interface ingress and egress sensors are modified for consistency from signalling to signaling.

  • Router advertisement module status on backup Routing Engine (MX Series)— The router advertisement module does not function in the backup Routing Engine as the Routing Engine does not send an acknowledgment message after receiving the packets. Starting in this Junos OS Release, you can view the router advertisement module information using the show ipv6 router-advertisement operational command.

    [See show ipv6 router-advertisement).]

Layer 2 Ethernet Services

  • New output fields for subscriber management statistics (MX Series)—If you enable the enhanced subscriber management, the non-DHCPv4 bootstrap protocol (BOOTP) requests might not get processed even if you configure the DHCP relay or server with the overrides bootp-support statement at the edit forwarding-options dhcp-relay hierarchy level. To monitor the DHCP transmit and receive packet counters, we've introduced the following output fields for show system subscriber-management statistics dhcp extensive operational command. - BOOTP boot request packets received - BOOTP boot reply packets received - BOOTP boot request packets transmitted - BOOTP boot reply packets transmitted

    [See show system subscriber-management statistics.]


  • Disable sending of RSVP hellos over a bypass LSP (MX Series)— Junos routers send RSVP hello packets over a bypass LSP (when one is present), instead of the IGP next hop. To return to the original behavior specify the no-node-hello-on-bypass option.

    [See no-node-hello-on-bypass.]

Network Management and Monitoring

  • Changes when deactivating or deleting instances of the ephemeral configuration database (ACX Series, EX Series, MX Series, PTX Series, QFX Series, SRX Series, vMX, and vSRX)—The following changes apply when you deactivate or delete ephemeral database instances in the static configuration database:

    • When you deactivate the entire [edit system configuration-database ephemeral] hierarchy level, the device deletes the files and corresponding configuration data for all user-defined ephemeral instances. In earlier releases, the files and configuration data are preserved; however, the configuration data is not merged with the static configuration database.
    • When you delete an ephemeral instance in the static configuration database, the instance's configuration files are also deleted. In earlier releases, the configuration files are preserved.
    • You can delete the files and corresponding configuration data for the default ephemeral database instance by configuring the delete-ephemeral-default statement in conjunction with the ignore-ephemeral-default statement at the [edit system configuration-database ephemeral] hierarchy level.

    [See Enable and Configure Instances of the Ephemeral Configuration Database.]


  • Changes to show mvpn c-multicast and show mvpn instance outputs —The FwdNh output field displays the multicast tunnel (mt) interface in the case of Protocol Independent Multicast (PIM) tunnels.

    [See show mvpn c-multicast.]