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NE20E-S2 V800R010C10SPC500 Configuration Guide - IP Services 01

This is NE20E-S2 V800R010C10SPC500 Configuration Guide - IP Services
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Configuring PMTUs

Configuring PMTUs

After a PMTU is configured, devices on a network send packets based on the same MTU so that packets do not need to be fragmented in the transmission process and the burden of intermediate devices is reduced. Therefore, network resources are efficiently utilized to achieve the optimal traffic throughput.

Pre-configuration Tasks

Before configuring PMTUs, configure the IPv6 MTU for an interface. For details, see Setting Interface Parameters.

Configuration Procedures

Perform one or more of the following configurations as required.

Devices can determine the dynamic PMTU by default. The dynamic PMTU is the smallest MTU of all interface MTUs on the path along the source to the destination.

To protect a device against attacks initiated by sending jumbo packets, configure a static PMTU that defines the maximum length of a packet that can be sent from the source to the destination.

The static PMTU is usually less than or equal to an IPv6 MTU of an interface along the link. If a static PMTU value is greater than the IPv6 MTU value of an interface, the device fragments packets based on the IPv6 MTU.

Configuring a Static PMTU

You can manually configure a static PMTU according to the minimum MTU of the path along which packets are sent, resulting in higher transmission efficiency.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run ipv6 pathmtu ipv6-address [ [ vpn-instance vpn-instance-name ] path-mtu ]

    The PMTU is configured for the path destined for a specified IPv6 address.

  3. Run commit

    The configuration is committed.

Setting the Aging Time of Dynamic PMTU Entries

The PMTU aging time changes the lifetime of dynamic PMTU entries in the buffer. Static PMTU entries do not age.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run ipv6 pathmtu age age-time

    The aging time of dynamic PMTU entries is set.

    The PMTU aging time changes the lifetime of the dynamic PMTU entries in the buffer and does not function static PMTU entries, because static PMTU entries do not age.

    When both static and dynamic PMTUs are configured, only static PMTUs take effect.

  3. Run commit

    The configuration is committed.

Verifying the Configuration of PMTUs

After configuring PMTUs, verify the configuration.

Prerequisites

PMTUs have been configured.

Procedure

  1. Run the display ipv6 pathmtu { ipv6-address | all | dynamic | static } command to check all PMTU entries.
  2. Run the display ipv6 interface [ interface-type interface-number | brief ] command to check the current MTU on an interface.

Example

Run the display ipv6 pathmtu command. The command output shows the destination IPv6 address, PMTU, aging time of PMTU entries, and type of PMTU entries.

<HUAWEI> display ipv6 pathmtu all
Total: 2        Dynamic: 1      Static: 1
-----------------------------------------------------------------------------

IPv6 Destination Address                 ZoneID  PathMTU  LifeTime(M)  Type     FF
2001:db8::2                               1      1500     10           Dynamic  NO
2001:db8::1                               1      1600     -            Static   NO

Run the display ipv6 interface command. The command output shows the current MTU on the interface.

<HUAWEI> display ipv6 interface gigabitethernet 0/1/0
GigabitEthernet0/1/0 current state : UP ,
IPv6 protocol current state : UP
link-local address is FE80::200:1FF:FE04:5D00
  Global unicast address(es):
    2001:db8::1, subnet is 2001:db8::/64
  Joined group address(es):
    FF02::1:FF00:1
    FF02::1:FF04:5D00
    FF02::2
    FF02::  MTU is 1500 bytes
  ND DAD is enabled, number of DAD attempts: 1
  ND reachable time is 1200000 milliseconds
  ND retransmit interval is 1000 milliseconds
  Hosts use stateless autoconfig for addresses
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Updated: 2019-01-02

Document ID: EDOC1100055376

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