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Configuration Guide - Ethernet Switching

CloudEngine 8800, 7800, 6800, and 5800 V200R003C00

This document describes the configuration of Ethernet services, including configuring MAC address table, link aggregation, VLANs, MUX VLAN, Voice VLAN, VLAN mapping, QinQ, GVRP, VCMP, STP/RSTP/MSTP, VBST, SEP, RRPP, ERPS, LBDT, and Layer 2 protocol transparent transmission.
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(Optional) Setting GARP Timers

(Optional) Setting GARP Timers


When many dynamic VLANs need to be registered or the network radius is large, using default values of timers may cause VLAN flapping and high CPU usage. In this case, increase values of the timers. The following values are recommended depending on the number of VLANs.
Table 8-6 Relationship between GARP timer values and number of dynamic VLANs that need to be registered


Number of Dynamic VLANs to Be Registered (N)

N <= 500

500 < N <= 1000

1000 < N <= 1500

N > 1500

GARP Hold timer

100 centiseconds (1 second)

200 centiseconds (2 seconds)

800 centiseconds (8 seconds)

1000 centiseconds (10 seconds)

GARP Join timer

600 centiseconds (6 seconds)

1200 centiseconds (12 seconds)

4000 centiseconds (40 seconds)

6000 centiseconds (1 minute)

GARP Leave timer

3000 centiseconds (30 seconds)

6000 centiseconds (1 minute)

20000 centiseconds (3 minutes and 20 seconds)

30000 centiseconds (5 minutes)

GARP LeaveAll timer

12000 centiseconds (2 minutes)

24000 centiseconds (4 minutes)

30000 centiseconds (5 minutes)

32765 centiseconds (5 minutes and 27.65 seconds)


  • Configure the LeaveAll timer.
    1. Run system-view

      The system view is displayed.

    2. Run garp timer leaveall timer-value

      The value of the LeaveAll timer is set.

      By default, the value of the LeaveAll timer is 1000 centiseconds (10 seconds).

      The Leave timer value on an interface is restricted by the global LeaveAll timer value. When configuring the global LeaveAll timer, ensure that all the interfaces configured with a GARP Leave timer are working properly.

    3. Run commit

      The configuration is committed.

  • Configure Hold, Join, and Leave timers.
    1. Run system-view

      The system view is displayed.

    2. Run interface interface-type interface-number

      The interface view is displayed.

    3. Run garp timer { hold | join | leave } timer-value

      The values of Hold, Join, and Leave timers are set.

      By default, the value of the Hold timer is 10 centiseconds, the value of the Join timer is 20 centiseconds, and the value of the Leave timer is 60 centiseconds.

      When configuring GARP timers on an interface, pay attention to the following points:
      • The undo garp timer command restores default values of GARP timers. If the default value of a timer is not within the allowed range, the undo garp timer command does not take effect.

      • The value range of each timer changes along with the values of other timers. If the configured value of a timer is not within the allowed range, you can change the value of the timer that determines the value range of this timer.

      • To restore default values of GARP timers, restore the default value of the Hold timer, and then restore default values of Join, Leave, and LeaveAll timers in sequence.

    4. Run commit

      The configuration is committed.

Updated: 2019-05-08

Document ID: EDOC1100004351

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