The MPLS WG Archive

[Khuzema Pithewan <KhuzemaP@netbrahma.com>]

Hi,

Irrespective of whether network is MPLS enabled or not, Srefresh messages
does reduces the number of Control Messages flowing on the wire drastically.
Too many control messages is one of dis-advantage of RSVP over LDP/CR-LDP in
MPLS network. Refresh reduction solves this problem through Srefresh
messages....

Khuzema. 



> ----------
> From: 	Ping Pan[SMTP:pingpan@juniper.net]
> Sent: 	Saturday, October 27, 2001 3:32 AM
> To: 	Arvind, K
> Cc: 	'mpls@uu.net'
> Subject: 	Re: RFC2961 BUNDLE message
> 
> Arvind,
> 
> RSVP soft-state refresh has two significant scaling problems: 
> - there are too many control packets on the wire, and 
> - refresh and trigger messages look the same (so they have to be
> processed the same way). 
> 
> RFC2961 is to fix both problems. Bundling message can stuff multiple
> messages in one frame, so that a router can take care of multiple
> sessions in one shot. (This is very important in many operating systems,
> where I/O overhead is generally greater than memory copy.) So bundling
> reduces the total number of messages. With the help of Srefresh, you can
> process refresh messages differently.
> 
> In short, RFC2961 can improve the performance greatly. In MPLS networks,
> I don't see any scalability problem caused by RSVP.
> 
> - Ping
> 
> 
> "Arvind, K" wrote:
> > 
> > Does the BUNDLE message offer any real benefit in terms of reducing
> control
> > overhead? There seems to be no significant change in the overall amount
> of
> > control traffic that is generated or processed as a result of bundling
> (even
> > though the traffic is bunched together resulting in fewer (but larger)
> > messages). Does this mechanism really help in scaling RSVP?  Could
> someone
> > throw light on this? Thanks.
> > 
> > Regards,
> > Arvind.
>