J-series Services Router Features

This section describes the new J-series Services Routers features, available with the JUNOS 8.3R4 release. For more information, see the following manuals:

• J4350 and J6350 Services Router Getting Started Guide
• J2300, J4300, and J6300 Services Router Getting Started Guide
• J-series Services Router Basic LAN and WAN Access Configuration Guide
• J-series Services Router Advanced WAN Access Configuration Guide
• J-series Services Router Administration Guide

For more information about the JUNOS Internet software that runs on Services Routers, see the manuals listed in Table 6.

Interfaces and Chassis

• New high-density Gigabit Ethernet uPIMs—Three new universal Physical Interface Modules (uPIMs) provide increased port density for Gigabit Ethernet connections. The uPIMs can be installed in either high-speed or regular slots on J4350 and J6350 Services Routers running JUNOS 8.3 or later. The new uPIMs are:

  • 8-port Gigabit Ethernet uPIMs with RJ-45 connectors
  • 16-port Gigabit Ethernet uPIMs with RJ-45 connectors (uses two slots)
  • 6-port Gigabit Ethernet uPIMs with small form-factor pluggable (SFP) connectors

  Caution: You can install a maximum of three 8-port Gigabit Ethernet uPIMs in a single J4350 or J6350 chassis. If you install the maximum of three 8-port Gigabit Ethernet uPIMs, only one of the remaining slots can be occupied, and it cannot contain an ePIM, uPIM, or Avaya VoIP module.

  For J-series Services Router PIM compatibility matrix and datasheets, go to https://www.juniper.net/products/jseries/.
• ISDN PRI support on Channelized T1/E1/ISDN PRI PIMs—Channelized T1/E1 PIMs are now called Dual-Port Channelized T1/E1/ISDN PRI PIMs and provide ISDN Primary Rate Interface (PRI) connectivity for dial-in and callback and for use as primary or backup network connections. You can configure up to 23 channelized T1 time slots or up to 30 channelized E1 time slots as an ISDN PRI group, with the 24th T1 time slot and the 16th E1 time slot operating as the D-channel to control the group of time slots as B-channels. T1 and E1 time slots unused by ISDN PRI can operate normally as DS0 interfaces. ISDN PRI B-channels run at 64 Kbps, but do not support the 56-Kbps line rate.

  ISDN PRI can operate in a Services Router chassis with ISDN BRI PIMs and supports ATT5ESS, ETSI (NET5), National ISDN (NI2), DMS100, and NTT switch types. The following ISDN features are supported:

  • Bandwidth on demand with Multilink Point-to-Point Protocol (MLPPP)
  • Dial-on-demand routing (DDR) backup
  • Dial backup
  • Authentication (CHAP and PAP)
  • On-demand routing
  • Dialer profiles and maps
  • Dial-in
  • Dialer callback

  A new bchannel-allocation option enables you to allocate a free B-channel for dial-out calls. This setting directs the router to select the first free bchannel with highest number (default) or lowest when dialing out.

• PAP support for PPP authentication—Previously, PPP supported only CHAP authentication. PPP now supports the Password Authentication Protocol (PAP), a simple two-way handshake to establish identity. PAP is used after the link establishment phase (LCP up), during the authentication phase. JUNOS software can support PAP in one direction (egress or ingress), and CHAP in the other.

  To configure PAP support on the physical interface, include the pap statement with options at the [edit interfaces interface-name ppp-options] hierarchy level. To configure PAP support on the logical interface, include the pap statement with options at the [edit interfaces interface-name unit logical-unit-number ppp-options] hierarchy level. To view information about the PAP states, issue the show ppp summary and show ppp interfaces operational mode commands.

User Interface and Configuration

• J-Web CLI terminal access—You can now connect to the JUNOS CLI from the J-Web user interface by means of a Java applet running on the Web client. The applet provides SSH2 support to connect to the router. To access the CLI from J-Web, select Diagnose>CLI Terminal.
• J-Web management enhancements—You can now set the maximum number of simultaneous user sessions and a default session timeout for all users. To configure user sessions, include the session-limit and idle-timeout statements at the [edit system services web-management session] hierarchy level. You can also configure the maximum number of simultaneous subordinate processes in response to user requests, by including the active-child-process statement at the [edit system services web-management limits] hierarchy level. The show system users command now includes users who logged in or out through J-Web.
• J-Web RPM timestamp support—The J-Web Quick Configuration pages for real-time performance monitoring (RPM) now include a check box for enabling hardware timestamping for ICMP ping, ICMP ping timestamp, UDP ping, and UDP ping timestamp probes, to improve the measurement of latency and jitter.
• Accounting files storage location setting—The default location for accounting log files can now be set to the DRAM disk file system instead of the compact flash. To configure this feature, include the nonpersistent statement at the [edit accounting-options file filename] hierarchy level. We recommend that you use the nonpersistent statement for all accounting files configured on your system. This setting minimizes the read/write traffic to the compact flash.

  Caution: Because all files saved to DRAM are deleted when the system reboots, be sure to back up these files to ensure that they are not lost.

Network Management

• RPM jitter enhancement for J-series Services Routers—The way in which jitter for real-time performance monitoring (RPM) probes is calculated has been modified. Previously, jitter included delay on the other system and resulted in artificially high jitter numbers, which could imply that the network was experiencing more congestion than it actually was.
• CoS scheduler transmit rate enhancement for J-series Services Routers—The minimum size of the class-of-service (CoS) scheduler transmit rate is increased to 1/10000 of the interface speed (from the original limit of 1/1000 of the interface speed). The smaller increments provide finer control of transmit rate, which is especially useful for high-speed interfaces such as Fast Ethernet and Gigabit Ethernet interfaces on J4350 and J6350 routers.

  With the earlier minimum transmit rate you could only assign 1/1000th part of the interface speed. Therefore, if the speed of the interface was 1000 Mbps, the minimum transmit rate would be 1000 Mbps x 1/1000=1 Mbps. Now with the minimum transmit rate of 1/10000 for the same interface, you can set the transmit rate of a queue to be 1000 Mbps x 1/10000 = 100 Kbps.