On a router, interfaces are numbered in the format of slot ID/subcard ID/interface sequence number.

The management interface (marked with the MGMT silkscreen) is numbered MEth0/0/0. Interfaces of different rates are numbered separately. For example, the first GE interface is numbered GE0/0/0, the first 10GE interface is numbered 10GE0/0/0, the first 25GE interface is numbered 25GE0/0/0, the first 40GE interface is numbered 40GE0/0/0, and the first multi-GE interface is numbered MultiGE0/0/0. Subsequent GE interfaces are numbered in ascending order, as are subsequent 10GE, 25GE, 40GE, and multi-GE interfaces.

• Slot ID

  The slot ID identifies the slot in which a card is installed.

  • The slot ID of an SRU is 0.
  • When slots are combined into one slot, the larger slot ID is used as the new slot ID. For example, when slot 1 and slot 2 are combined, slot ID 2 is used as the new slot ID.
• Subcard ID

  The subcard ID specifies the ID of a subcard. Since the router does not support subcards, its subcard ID is fixed at 0.

• Interface sequence number

  The interface sequence number indicates the position of an interface on a card.

  Table 3-3 Interface numbering conventions on the AR5700, AR6700, and AR8000 series routers

  Interface Numbering Diagram	Description
  	If there is only one row of interfaces on an interface card, these interfaces are numbered from left to right, starting from 0/0/0.
  	If there are two rows of interfaces on an interface card, these interfaces are numbered from bottom to top and left to right starting from 0/0/0.
  	If there are two rows of interfaces on an interface card, these interfaces are numbered from top to bottom and left to right starting from 0/0/0.