CIST port configuration

CIST port parameters are used to modify MRST operation on an individual port basis. CIST parameters do not affect operation of STP/PVST.

For each port, CIST is turned on by default. Port parameters include:

Port priority

Port path cost

Port Hello time

Link type

Edge

On and off

Current port configuration

The port option of MRST is turned on by default.

The following table describes the commands used to configure CIST Port Configuration commands.

Table 82 CIST Port Configuration commands

Command

Description

spanning-tree mstp cist

Configures the CIST port priority. The port priority helps determine

interface-priority {<0-240>}

which bridge port becomes the designated port. In a network topology

 

that has multiple bridge ports connected to a single segment, the port

 

with the lowest port priority becomes the designated port for the

 

segment. The range is 0 to 240, in steps of 16 (0, 16, 32...), and the

 

default is 128.

 

Command mode: Interface port

spanning-tree mstp cist path- cost {<1-200000000>}

Configures the CIST port path cost. The port path cost is used to help determine the designated port for a segment. Generally speaking, the faster the port, the lower the path cost. The default is 20000 for Gigabit ports.

Command mode: Interface port

spanning-tree mstp cist hello {<1-10>}

Configures the CIST port Hello time. The Hello time specifies how often the root bridge transmits a configuration bridge protocol data unit (BPDU). Any bridge that is not the root bridge uses the root bridge Hello value. The range is 1 to 10 seconds, and the default is 2 seconds.

Command mode: Interface port

spanning-tree mstp cist link- type {autop2pshared}

Defines the type of link connected to the port, as follows:

auto: Configures the port to detect the link type, and automatically match its settings.

p2p: Configures the port for Point-To-Point protocol.

shared: Configures the port to connect to a shared medium (usually a hub).

The default link type is auto. Command mode: Interface port

[no] spanning-tree mst cist edge

Enables or disables this port as an edge port. An edge port is not connected to a bridge, and can begin forwarding traffic as soon as the link is up. Configure server ports as edge ports (enabled). This command is disabled by default.

Command mode: Interface port

spanning-tree mst cist enable

Enables CIST on the port.

 

Command mode: Interface port

no spanning-tree mst cist

Disables CIST on the port.

enable

Command mode: Interface port

show interface port {<port

Displays the current CIST port configuration.

number>} spanning-tree mstp

Command mode: All

cist

 

Configuration Commands 77

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NEC N8406-022 manual Cist port configuration

N8406-022 specifications

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