Subject: [mpls] Bidirectional RSVP-TE tunnel

From: xuxiaohu 41208 <[email-masked]>
Date: Thu, 06 Oct 2005 14:43:09 +0800

Dear members of the mpls distribution list: 

I would like to introduce some ideas about Bidirectional RSVP-TE tunnel, any comments from you is welcomed.

Through the binding of two unidirectional RSVP-TE tunnels established between a pair of LSRs destined to each other, a bidirectional RSVP-TE tunnel is formed. Like GRE/IPsec tunnel.

The bidirectional RSVP-TE tunnel can be used to establish L3VPN with virtual router. In contrast to BGP/MPLS VPN defined in [RFC2547bis], multicast is easier to be implemented and multicast traffics can travel in RSVP-TE tunnel with such L3VPN. This L3VPN fully inherits the property of RSVP-TE, such as TE, QoS and fast convergence features. In addition, the bidirectional RSVP-TE tunnel has many other purposes, such as interconnection of two
 separate routing domains through a RSVP-TE tunnel and implementing LDP over TE. 

The decision factors of RSVP-TE tunnel binding include tunnel source address, tunnel destination address and binding key. The reason for making binding key as one of the decision factors is that a LSR can setup different RSVP-TE tunnels with the same pair of tunnel source address and tunnel destination address, but these tunnel interfaces must be configured with different binding keys. 

Any comment is welcomed! 

Best regards! 

Steven Joe 

Huawei Technologies Co.,Ltd. 

[email-masked] 

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