Changes in J-series Services Router Default Behavior

Platform and Infrastructure

• Operational mode command outputs changed—The show chassis hardware and show chassis environment commands now show the status of redundant power supply modules in the J6300 and J6350 Services Routers. In addition, the output of the show chassis alarms and show system alarms commands now includes power-module-related alarms, if present.

  [J-series Services Router Administration Guide]

• Unsupported encapsulation type removed—Because flexible VLAN tagging is not supported on Fast Ethernet interfaces installed in J-series Services Routers, the flexible-vlan-tagging statement has been removed from the [edit interfaces fe-fpc/pic/port] hierarchy level in the CLI.

Interfaces and Chassis

• Gigabit Ethernet interfaces (J4350 and J6350 Services Routers)—By default, Gigabit Ethernet interfaces installed in J4350 and J6350 Services Routers autonegotiate the link mode and speed settings. For JUNOS Release 8.1 and later:
  • When you manually configure either the link mode or speed setting (not both settings), the system ignores the configuration and generates a system log message.
  • When you configure both the link mode and the speed, the link negotiates with your manually configured settings whether autonegotiation is enabled or disabled. Previously, your settings were ignored when autonegotiation was enabled.
  • If you disable autonegotiation and do not manually configure the link mode and the speed, the link is negotiated at 1000 Mbps full duplex.

  [J-series Services Router Basic LAN and WAN Access Configuration Guide]

• MTU change for Gigabit Ethernet interfaces (J4350 and J6350 Services Routers)—The maximum configurable MTU value has been changed to 9018 bytes. If you configure an MTU value greater than 9018, the system does not accept the configuration and generates an error message similar to the following:

  Sep 5 15:55:48 aspen /kernel: ge-0/0/1: Illegal media change. MTU invalid: 9192.
  Max MTU supported on this PIC: 9018

  [J-series Services Router Basic LAN and WAN Access Configuration Guide]

• MTU change for 4-Port Fast Ethernet ePIM interfaces (J4350 and J6350 Services Routers)—The maximum configurable MTU value has been changed to 1514 bytes. If you configure an MTU value greater than 1514, the system does not accept the configuration and generates an error message similar to the following:

  Sep 5 15:55:48 aspen /kernel: fe-3/0/1: Illegal media change. MTU invalid: 9192. 
  Max MTU supported on this PIC: 1514

  [J-series Services Router Basic LAN and WAN Access Configuration Guide]

• MAC address filtering not supported on Gigabit Ethernet and Fast Ethernet interfaces—MAC address filtering is not supported on Gigabit Ethernet and 4-port Fast Ethernet interfaces. In previous software releases, the unsupported source-filtering statement at the [edit interfaces interface-name fastether-options] hierarchy level was available for these routers. However, this statement is no longer available in the CLI.

User Interface and Configuration

J-Web support for RPM hardware timestamping—The J-Web user interface now includes a setting for the hardware-timestamp statement.

[J-series Services Router Administration Guide]