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[MX] How to configure MX10003 MPC interface speed

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Article ID: KB35254 KB Last Updated: 25 Nov 2019Version: 1.0
Summary:

Each Packet Forwarding Engine (PFE) of an MX10003 MPC has 400Gbps of bandwidth which cannot be oversubscribed and a MAC number limitation.

This article will explain how to configure an MX10003 MPC.

Symptoms:

On an MX10003 MPC, there is a port checker to check whether the combination of ports is valid or not.

https://apps.juniper.net/home/port-checker/

Although you cannot oversubscribe the 400Gbps, it fails to configure port 0, 1 of pic 0 and port 0,1,2,3 of pic 1 to 40G. However, it can successfully configure port 0 and 1 of pic 0, port 0,1,2 to 40G, and port 3 of pic 1 to 100G.

Solution:

The MX10003 MPC has two pic's; pic 0 is fixed and pic 1 is plug-able.

  • PIC 0 supports 40G, 4*10G and 4*1G.
  • PIC 1 supports 100G, 40G, 4*10G and 4*1G.
  1. The MX10003 MPC supports three PFE's. The forwarding capacity of each PFE is 400Gbps which cannot be oversubscribed.
    The MIC supports 12 ports. Each PFE is mapped to 4 ports of the MIC. Port 0 through port 3 are mapped to PFE0, port 4 through port 7 are mapped to PFE1, and port 8 through port 11 are mapped to PFE2. The fixed-port PIC supports 6 ports. Each PFE is mapped to two ports of the fixed-port PIC. Port 0 and port 1 are mapped to PFE0, port 2 and port 3 are mapped to PFE1, and port 4 and port 5 are mapped to PFE2.

    For example, port 0, 1 of PIC 0 , and port 0, 1, 2, 3 of PIC1 in the same PFE.

  2. Each PFE uses an EA ASIC. Each EA ASIC supports 2 non-channelized MACs (aka. CMACPCS) and 2 channelized MACs (aka. CHMAC).

    Here is the MAC capability:

    1  CMACPCS.  support    1*100GE MAC
    1  CHMAC.    support    1*100GE MAC  or  3*40GE MAC    or  12 * 10 GE MAC.
  3. The MX10003 MPC supports two modes: pic mode and port mode.

    • In pic mode, all ports have the same speed. A CHMAC can be shared between PICs.
      So if we configure port 0, 1 of PIC 0, port 0, 1, 2, 3 of PIC1 to  40G, it uses 1 CHMAC for pic 0, due to 1 CHMAC support 3*40GE. The remaining one 40GE MAC will share with the one on pic1.
      That’s why it is valid if all of the 6 ports configure to 40G in PIC mode.

    • In Port mode, which allows you to configure different speeds on each port, a CHMAC cannot be shared between PICs.
      So if we try to configure port 0, 1 of PIC 0, port 0, 1, 2, 3 of PIC1 to  40G, it will fail. It uses 1 CHMAC for pic 0, the remain one 40GE MAC can not share with the one on pic1.
      And pic 1 use another CHMAC, which support 3 *40GE. If we configure the remaining port to 40G, it will report invalid on the port check tools because there is not enough MAC.
      While if we configure the remaining port to 100G, due to the 2 non-channelized MACs (CMACPCS) not being in use, it will use a CMACPCS for the 100G port.

      That's why configuring 6 ports (port 0, 1 of PIC 0, port 0, 1, 2, 3 of PIC1) to 40G fails, but configuring 5 ports to 40G with the remaining port to 100G is successful.

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