Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

Navigation
Guide That Contains This Content
[+] Expand All
[-] Collapse All

    Configuring Fragment Reassembly Parameters

    On the MobileNext Broadband Gateway, anchor session Dense Port Concentrators (DPCs) reassemble arriving user plane packet fragment in order to have complete Layer 4 and above information. To prevent reassembly deadlock while waiting for fragments that never arrive, you can configure the time interval that the anchor session DPCs wait for fragments to arrive and the maximum number of packets that can be waiting for fragments.

    Before you begin configuring reassembly parameters on the broadband gateway, you should have done the following:

    • Configured the chassis of the broadband gateway
    • Configured the interfaces of the broadband gateway
    • Configured the general redundancy parameters for the broadband gateway

    To determine the fragment reassembly behavior, you configure the timeout and maximum packets pending fragment parameters. You can group these parameters into an IP reassembly profile. More than one IP reassembly profile can be configured and applied to a particular gateway.

    To configure the reassembly parameters:

    1. Configure a value for the timeout in the reassembly profile.
      [edit services ip-reassembly reassembly-profile-one ]user@host# set timeout 2

      Note: You can set the timeout value from 2 through 60 seconds. The default value is 2 seconds.

    2. Configure a value for the max-reassembly-pending-packets in the reassembly profile.
      [edit services ip-reassembly reassembly-profile-one ]user@host# set max-reassembly-pending-packets 100

      Note: You can set the maximum packets pending reassembly value from 100 through 100,000 packets. The default value is 100 packets.

    3. Configure the broadband gateway to use the IP reassembly profile.
      [edit unified-edge gateways ggsn-pgw MBG1 ]user@host# set ip-reassembly-profile reassembly-profile-one

      Note: You can configure multiple IP reassembly profiles, but apply only one to a particular broadband gateway.

    Published: 2011-11-16