Subject: The primary improve from 2547bit to HoPE

From: Bin Li <[email-masked]>
Date: Mon, 18 Nov 2002 15:11:25 +0800

Hi, all
Since I have commit the draft about  hierarchical PE, someone agrued that this mechanism can be realized just according rfc2547bis, It's unnessary to commit a new draft. 
The primary diffrence between 2547bis and HoPE are listed below: 

> 1 SPE only send aggregate vpnv4 routes or a default vpnv4 route rather than all vpnv4 routes  to UPE.
> 2 Because vpnv4 routes are aggregated in SPE, SPE must terminate the LSP which is from UPE. It pop the vpn label and look forward vrf routing table, then push a new vpn label.
> 3 UPE should advertise its import route target list to SPE. SPE will form a HoPE-wide import route target list to filter vpnv4 routes from other PEs. 

> The above mechanisms are not described in draft 2547bis. And the PE just according 2547bis can't work as a SPE now. So I commit this proposal.

Regards,
Libin