3com 8807 User Guide

The intermixing feature is used to enable deployment of MPLS VPN services on 
cards that do not support MPLS. Switch 8800 Family routing switches support 
various modes of MPLS VPN function and provide abundant and differentiated 
MPLS VPN service to meet the differentiated needs of different users in the 
performance, reliability, port utilization of MPLS VPN functions.

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Unless otherwise specified, MPLS VPN services are processed by the 
MPLS-supporting interface cards. In this manual, an interface card that 
supports MPLS function is called MPLS card for short, and an interface card 
that does not support MPLS function is called non-MPLS card for short.

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The purpose of card intermixing is to enable the non-MPLS cards to support 
MPLS function through the MPLS cards. Refer to the "VPN" section in this 
manual for the information on the processing of MPLS VPN through VPLS 
Application Modules.

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Card intermixing does not support using XP4B and other interface cards on 
which ACL redirection is configured under the port group as non-MPLS card for 
intermixing.

The implementation mechanism for card intermixing is as follows:

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The MPLS card and the non-MPLS card co-exist in the same switch;

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Use the port of the non-MPLS card for the access to the service private network 
side of the MPLS VPN ;

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Redirect the port of the non-MPLS card through QACL, to redirect the received 
packets to the specified MPLS card for processing;

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The port of MPLS card is set as Loopback port automatically and the port type 
is Trunk;

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The access port of the non-MPLS card and the Loopback port of the MPLS card 
belong to the same VLAN.

The port on the MPLS card can also be used for the access to the service private 
network side of the MPLS VPN. In this case, you do not need to configure card 
intermixing, and you must use the port of the MPLS card for the connection with 
the MPLS public network side.