The release of this book has been timed with a new product announcement from Juniper. The MX2020 is a new router in the MX Series that’s designed to solve the 10G and 100G high port density needs of Content Service Providers (CSP), Multisystem Operators (MSO), and traditional Service Providers. At a glance, the MX2020 supports 20 line cards, 8 switch fabric boards, and 2 routing engines. The chassis takes up an entire rack and has front-to-back cooling.
The MX2020 is a standard backplane-based system, albeit at a large scale. There are two backplanes connected together with centralized switch fabric boards (SFB). The routing engine and control board is a single unit that consumes a single slot, as illustrated in Figure 1-39 on the far left and right.
The FPC numbering is the standard Juniper method of starting at the bottom and moving left to right as you work your way up. The SFBs are named in the same method starting with zero starting on the left and going all the way to seven on the far right. The routing engine and control boards are located in the middle of the chassis on the far left and far right.
Each backplane has 10 slots that are tied into eight SFBs in the middle of
the chassis. Because of the high number of line cards and PFEs the
switch fabric must support, a new SFB was created specifically for the
MX2020. The SFB is able to support more PFEs and has a much higher
throughput compared to the previous SCBs. Recall that the SCB and SCBE
presented its chipsets to Junos as a fabric plane and can be seen with
show chassis fabric summary
command; the new SFB has multiple chipsets as well, but presents them
as an aggregate fabric plane to Junos. In other words, each SFB will
appear as a single fabric plane within Junos. Each SFB will be in an
Active state by default. Let’s take a look at the installed SFBs
show chassis hardware | match SFBSFB 0 REV 01 711-032385 ZE5866 Switch Fabric Board SFB 1 REV 01 711-032385 ZE5853 Switch Fabric Board SFB 2 REV 01 711-032385 ZB7642 Switch Fabric Board SFB 3 REV 01 711-032385 ZJ3555 Switch Fabric Board SFB 4 REV 01 711-032385 ZE5850 Switch Fabric Board SFB 5 REV 01 711-032385 ZE5870 Switch Fabric Board SFB 6 REV 04 711-032385 ZV4182 Switch Fabric Board SFB 7 REV 01 711-032385 ZE5858 Switch Fabric Board
There are eight SFBs installed; now let’s take a look at the switch fabric status:
show chassis fabric summaryPlane State Uptime 0 Online 1 hour, 25 minutes, 59 seconds 1 Online 1 hour, 25 minutes, 59 seconds 2 Online 1 hour, 25 minutes, 59 seconds 3 Online 1 hour, 25 minutes, 59 seconds 4 Online 1 hour, 25 minutes, 59 seconds 5 Online 1 hour, 25 minutes, 59 seconds 6 Online 1 hour, 25 minutes, 59 seconds 7 Online 1 hour, 25 minutes, 59 seconds
The power supply on the MX2020 is a bit different than the previous MX models. The MX2020 power system is split into two sections: top and bottom. The bottom power supplies provide power to the lower backplane line cards, lower fan trays, SFBs, and CB-REs. The top power supplies provide power to the upper backplane line cards and fan trays. The MX2020 provides N + 1 power supply redundancy and N + N feed redundancy. There are two major power components that supply power to the MX2020:
- Power Supply Module
The Power Supply Modules (PSM) are the actual power supplies that provide power to a given backplane. There are nine PSMs per backplane, but only eight are required to fully power the backplane. Each backplane has 8 + 1 PSM redundancy.
- Power Distribution Module
There are two Power Distribution Modules (PDM) per backplane, providing 1 + 1 PDM redundancy for each backplane. Each PDM contains nine PSMs to provide 8 + 1 PSM redundancy for each backplane.
The majority of data centers support hot and cold aisles, which require equipment with front to back cooling to take advantage of the airflow. The MX2020 does support front to back cooling and does so in two parts, as illustrated in Figure 1-42. The bottom inlet plenum supplies cool air from the front of the chassis and the bottom fan trays force the cool air through the bottom line cards; the air is then directed out of the back of the chassis by a diagonal airflow divider in the middle card cage. The same principal applies to the upper section. The middle inlet plenum supplies cool air from the front of the chassis and the upper fan trays push the cool air through the upper card cage; the air is then directed out the back of the chassis.
The MX2020 is compatible with all Trio-based MPC line cards; however, there will be no backwards compatibility with the first-generation DPC line cards. The caveat is that the MPC1E, MPC2E, and MPC3E line cards will require a special MX2020 Line Card Adapter. The MX2020 can support up to 20 Adapter Cards (ADC) to accommodate 20 MPC1E through MPC3E line cards. Because the MX2020 uses a newer-generation SFB with faster bandwidth, line cards that were designed to work with the SCB and SCBE must use the ADC in the MX2020.
The ADC is merely a shell that accepts MPC1E through MPC3E line
cards in the front and converts power and switch fabric in the rear.
Future line cards built specifically for the MX2020 will not require
the ADC. Let’s take a look at the ADC status with the
show chassis adc command:
show chassis adcSlot State Uptime 3 Online 6 hours, 2 minutes, 52 seconds 4 Online 6 hours, 2 minutes, 46 seconds 8 Online 6 hours, 2 minutes, 39 seconds 9 Online 6 hours, 2 minutes, 32 seconds 11 Online 6 hours, 2 minutes, 26 seconds 16 Online 6 hours, 2 minutes, 19 seconds 17 Online 6 hours, 2 minutes, 12 seconds 18 Online 6 hours, 2 minutes, 5 seconds
In this example, there are eight ADC cards in the MX2020. Let’s take a closer look at FPC3 and see what type of line card is installed:
show chassis hardware | find "FPC 3"FPC 3 REV 22 750-028467 YE2679 MPC 3D 16x 10GE CPU REV 09 711-029089 YE2832 AMPC PMB PIC 0 BUILTIN BUILTIN 4x 10GE(LAN) SFP+ Xcvr 0 REV 01 740-031980 B10M00015 SFP+-10G-SR Xcvr 1 REV 01 740-021308 19T511101037 SFP+-10G-SR Xcvr 2 REV 01 740-031980 AHK01AS SFP+-10G-SR PIC 1 BUILTIN BUILTIN 4x 10GE(LAN) SFP+ PIC 2 BUILTIN BUILTIN 4x 10GE(LAN) SFP+ Xcvr 0 REV 01 740-021308 19T511100867 SFP+-10G-SR PIC 3 BUILTIN BUILTIN 4x 10GE(LAN) SFP+
The MPC-3D-16X10GE-SFPP is installed into FPC3 using the ADC for compatibility. Let’s check the environmental status of the ADC installed into FPC3:
show chassis environment adc | find "ADC 3"ADC 3 status: State Online Intake Temperature 34 degrees C / 93 degrees F Exhaust Temperature 46 degrees C / 114 degrees F ADC-XF1 Temperature 51 degrees C / 123 degrees F ADC-XF0 Temperature 61 degrees C / 141 degrees F
Each ADC has two chipsets, as shown in the example output: ADC-XF1 and ADC-XF2. These chipsets convert the switch fabric between the MX2020 SFB and the MPC1E through MPC3E line cards.
Aside from the simple ADC carrier to convert power and switch fabric, the MPC-3D-16X10GE-SFPP line card installed into FPC3 works just like a regular line card with no restrictions. Let’s just double check the interface names to be sure:
show interfaces terse | match xe-3Interface Admin Link Proto Local Remote xe-3/0/0 up down xe-3/0/1 up down xe-3/0/2 up down xe-3/0/3 up down xe-3/1/0 up down xe-3/1/1 up down xe-3/1/2 up down xe-3/1/3 up down xe-3/2/0 up down xe-3/2/1 up down xe-3/2/2 up down xe-3/2/3 up down xe-3/3/0 up down xe-3/3/1 up down xe-3/3/2 up down xe-3/3/3 up down