Configuring A Demux Card; Overview; Mio Demux Restrictions - Cisco ASR 5500 Administration Manual

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Configuring a Demux Card

You can dedicate a DPC/UDPC or DPC2/UDPC2, or MIO/UMIO to function as a demux card. Demux is a
generic term for signal demultiplexing tasks. These are the tasks are responsible for parsing call setup (signaling
packets) and distributing the calls internally. For this reason there almost as many tasks running on a demux
card as there are services.
The vpnmgr tasks responsible for each context also run on the demux card. The number of vpnmgr tasks
correspond to the number of contexts. A vpnmgr is responsible for IP address assignment to mobile equipment,
IP routing (such as BGP, OSPF), as well as a variety of associated tasks.

Overview

Designating a DPC/UDPC or DPC2/UDPC2, or MIO/UMIO as a demux card frees up resources for session
handling, which has the potential to increase system throughput. However, there is no increased support in
total subscriber capacity due to other system resource restrictions.
This feature is disabled by default and can be enabled via the Global Configuration mode require demux
command. It is only supported for a limited number of products. Refer to the product Administration Guide
for additional information.
To support this feature session recovery must also be enabled via the Global Configuration mode require
session recovery command.
Important
Caution Enabling the Demux on MIO/UMIO feature changes resource allocations within the system. This directly
impacts an upgrade or downgrade between StarOS versions in ICSR configurations. Contact Cisco TAC
for procedural assistance prior to upgrading or downgrading your ICSR deployment.

MIO Demux Restrictions

The following restrictions apply when enabling an MIO/UMIO as a demux card:
• The require demux management-card command must be configured before any service or contexts
Description
Port has been gone down because the min-link criteria is not met.
After enabling demux card and session recovery, you must save the configuration and reboot the ASR
5500 to enable this feature.
have been created on the system. The command will not execute after a mode of operation has been
selected for the chassis.
ASR 5500 System Administration Guide, StarOS Release 19
Configuring a Demux Card
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