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A primary and backup U-PW switchover is triggered by a command.
Hub-spoke networking
The hub-spoke network model has one hub site and multiple spoke sites. The spoke sites cannot
directly communicate with each other. Traffic between spoke sites must travel through the hub site,
so the hub site can implement centralized traffic management.
Only static PWs and LDP PWs support the hub-spoke network model.
Figure 122 Hub-spoke model of VPLS
As shown in
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The CE in the hub site is called a hub-CE.
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The PE connected to the hub site is called a hub-PE.
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A CE in a spoke site is called a spoke-CE.
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A PE connected to a spoke site is called a spoke-PE.
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A link (AC or PW) towards the hub site is called a hub link. You must specify one and only one
hub link in a VSI.
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A link (AC or PW) towards a spoke site is called a spoke link.
In the hub-spoke VPLS network, a PE performs MAC address learning and forwarding as follows:
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After receiving a packet from a spoke link, the PE performs MAC address learning and forwards
the packet to the hub link.
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After receiving a packet from the hub link, the PE does not learn the MAC address. Instead, it
searches the MAC address table to forward the packet to a spoke link.
Compatibility information
Commands and descriptions for centralized devices apply to the following routers:
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MSR1002-4/1003-8S.
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MSR2003.
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MSR2004-24/2004-48.
Figure
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