Configuring, Modifying, and Monitoring the Unit

Inter-Switch VLAN or ISVLAN

The inter-switch VLAN conforms to the standard IEEE 802.1q, which describe the method of passing tagged frames through a physical link. To satisfy the need, the frame format should be changed and 4 more bytes are added to the frame header between the end of address field and the frame type.

Tag Field Format

This is a 4 bytes long field divided into two sub-fields of 2 bytes respectively named TPID and TCI.

TPID is the Tag Protocol Identifier which identifies the tag type of the frame.

TCI contains the user priority bits and the VID (VLAN Identifier).

Principles of ISVLAN

To configure a tagged port that could carry specific tagged frames you need the necessary information about how our ISVLAN works.

The port declared as tagged port should belong to all the VLAN’s you are willing to interconnect between multiple switches with the command set-tag-outbound-mode.

Once you have declared the tagged port you can create the specific VLAN’s using the command set provided in this section.

Viewing the ISVLAN Mode

get-tag-outbound-mode

The get-tag-outbound-modecommand shows the VLAN Tagging ports’ state. A “T” indicates that the Tagging mode off the port is on, “A” indicates that the Tagging is off.

get-tag-outbound-mode {runnvram}

Example

SYS_telnet>get-tag-outbound-mode

1 2 3 4 5 6 7 8 9 10 11 12

================================================

T A A A A A A A A A A A

13 14 15 16 17 18 19 20 21 22 23 24

================================================

A A A A A A A A A A A A

25

====

A

NOTE: The letter T means the port is set to tag mode. The letter A means the port is set to access.

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IBM NH2025-10 manual Inter-Switch Vlan or Isvlan, Tag Field Format, Principles of Isvlan, Viewing the Isvlan Mode

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