Re: What is the 'tunnel mpls traffic-en bandwidth' ?
the ip rsvp bandwidth specifies the total amount of resources available outbound an interface = total reserveable bandwidth on the link it can even bei higher then effective interface speed.
The other command specifies the amount of bandwidth to be used in the reservation for the specific MPLS TE tunnel and has to be lower then the first one in order for the link to be selected and used for the tunnel. If no suitable path is found the tunnel setup fails.
To be noted the bandwidth associated to an MPLS TE Tunnel is an administrative parameter and does not reflect the effective traffic that can travel over the tunnel.
The Call admission control is performed on the administrative bandwidth parameter not on effective user traffic.
the configuration of ip rsvp bandwidth is mandatory to assign resources to the interface, otherwise the link is not usable by MPLS TE.
The association of a tunnel bandwidth to an MPLS TE tunnel becomes the BW parameter in the RSVP messages that are exchanged to effectively create the tunnel end-to-end ( signalling phase)
The tunnel bandwidth can influence what links can be used to setup the TE tunnel
only links with remaining RSVP bandwidth > tunnel BW can be used, If no end-to-end path is found the tunnel will stay down with a message of PATH calculation error (there are the tunnel priorities that can play a role, for sake of simplicity we do not consider them here).
This document is an early notification of a behaviour change that will be introduced in IOS XR release 6.5.
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