IP Addressing: Fragmentation and Reassembly Configuration Guide, Cisco IOS XE Release 3S
IPv6 Virtual Fragmentation Reassembly
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IPv6 Virtual Fragmentation Reassembly

IPv6 Virtual Fragmentation Reassembly

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/​go/​cfn. An account on Cisco.com is not required.

Information About IPv6 Virtual Fragmentation Reassembly

IPv6 Virtual Fragmentation Reassembly

Fragmentation is a process of breaking down an IP datagram into smaller packets to be transmitted over different types of network media. Non-initial fragments of a fragmented IPv6 packet is used to pass through IPsec and NAT64 without any examination due to the lack of the L4 header, which usually is only available on the initial fragment. The IPv6 Virtual Fragmentation Reassembly (VFR) feature provides the ability to collect the fragments and provide L4 info for all fragments for IPsec and NAT64 features.

How to Implement IPv6 Virtual Fragmentation Reassembly

Configuring IPv6 Virtual Fragmentation Reassembly

SUMMARY STEPS

    1.    enable

    2.    configure terminal

    3.    interface type number

    4.    ipv6 virtual-reassembly [in | out] [max-reassemblies maxreassemblies] [max-fragments max-fragments] [timeout seconds] [drop-fragments

    5.    exit

    6.    show ipv6 virtual-reassembly interface interface-type

    7.    show ipv6 virtual-reassembly features interface interface-type


DETAILED STEPS
     Command or ActionPurpose
    Step 1 enable


    Example:
    Router> enable 
     

    Enables privileged EXEC mode.

    • Enter your password if prompted.
     
    Step 2 configure terminal


    Example:
    Router# configure terminal 
     

    Enters global configuration mode.

     
    Step 3 interface type number


    Example:
    Router(config)# interface gigabitethernet 3/1/1 
     

    Specifies an interface type and number, and places the router in interface configuration mode.

     
    Step 4 ipv6 virtual-reassembly [in | out] [max-reassemblies maxreassemblies] [max-fragments max-fragments] [timeout seconds] [drop-fragments

    Example:
    Router(config-if)# ipv6 virtual-reassembly max-reassemblies 32 max-fragments 4 timeout 7
     

    Enables VFR on an interface.

     
    Step 5 exit


    Example:
    Router(config-if)# exit
     

    Exits interface configuration mode and places the router in global configuration mode.

    • Enter this command twice to reach privileged EXEC mode.
     
    Step 6 show ipv6 virtual-reassembly interface interface-type

    Example:
    Router# show ipv6 virtual-reassembly interface e1/1/1
     

    Displays VRF configuration and statistical information on a specific interface.

     
    Step 7 show ipv6 virtual-reassembly features interface interface-type

    Example:
    Router# show ipv6 virtual-reassembly features
     

    Displays VFR information on all interfaces or on a specified interface.

     

    Configuration Example for IPv6 Virtual Fragmentation Reassembly

    Example: Configuring IPv6 Virtual Fragmentation Reassembly

    Router# show ipv6 virtual-reassembly interface gigabitethernet1/1/1
    GigabitEthernet1/1/1: 
    IPv6 Virtual Fragment Reassembly (VFR) is ENABLED(in)
    Concurrent reassemblies (max-reassemblies): 64
    Fragments per reassembly (max-fragments): 16
    Reassembly timeout (timeout): 3 seconds
    Drop fragments: OFF
    Current reassembly count: 0
    Current fragment count: 0
    Total reassembly count: 6950
    Total reassembly timeout count: 9
    GigabitEthernet1/1/1: 
    IPv6 Virtual Fragment Reassembly (VFR) is ENABLED(out)
    Concurrent reassemblies (max-reassemblies): 64
    Fragments per reassembly (max-fragments): 16
    Reassembly timeout (timeout): 3 seconds
    Drop fragments: OFF
    Current reassembly count: 0
    Current fragment count: 0
    Total reassembly count: 0
    Total reassembly timeout count: 0

    Additional References

    Related Documents

    Related Topic

    Document Title

    IPv6 addressing and connectivity

    IPv6 Configuration Guide

    Cisco IOS commands

    Master Commands List, All Releases

    IPv6 commands

    IPv6 Command Reference

    Cisco IOS IPv6 features

    IPv6 Feature Mapping

    Standards and RFCs

    Standard/RFC

    Title

    RFCs for IPv6

    IPv6 RFCs

    Technical Assistance

    Description

    Link

    The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.

    http:/​/​www.cisco.com/​cisco/​web/​support/​index.html

    Feature Information for IPv6 Virtual Fragmentation Reassembly

    The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

    Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/​go/​cfn. An account on Cisco.com is not required.

    Table 1 Feature Information for IPv6 Virtual Fragmentation Reassembly

    Feature Name

    Releases

    Feature Information

    IPv6 Virtual Fragmentation Reassembly

    Cisco IOS XE Release 3.4S

    The IPv6 VFR feature provides the ability to collect the fragments and provide L4 info for all fragments for IPsec and NAT64 features.