Interface numbering of cards on S series switches

The numbering rules for interfaces are as follows.

Before the clustering function is enabled, interfaces on the switch are numbered in the format of slot ID/subcard ID/interface sequence number.
After the clustering function is enabled, interfaces on the switch are numbered in the format of chassis ID/slot ID/subcard ID/interface sequence number.
- Chassis ID: indicates the ID of a member switch in the CSS system, with the value of 1 or 2.
- Slot ID: indicates the slot where a card is installed.
- Subcard ID: indicates the ID of a subcard on the LPU.
- Interface sequence number: indicates the number of each interface on the card.

For example, if a card is installed in slot 3 of a switch, the fifth interface from left to right and top to bottom on the card is numbered 3/0/4. If the clustering function is enabled and the cluster ID is 1, the interface is numbered 1/3/0/4.
Particularly, a 40GE interface can be split into four 10GE interfaces. Then, the numbering rules for interfaces are as follows:
If the 40GE interface is numbered 40GE x/y/0/n, the four converted 10GE interfaces are numbered 10GE x/y/1/(4n+z).
- x: indicates the chassis ID, that is, the cluster ID. The value exists only in a cluster.
- y: indicates the slot number of a card.
- n: indicates the sequence number of a 40GE interface, starting from 0.
- z: indicates the interface location. The value is in the range from 0 to 3.
For example, before the clustering function is enabled, a 40GE interface is numbered 40GE1/0/1. The four 10GE interfaces are numbered 10GE1/1/4, 10GE1/1/5, 10GE1/1/6, and 10GE1/1/7.

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