[c-nsp] How does IOS do loadshaing with ECMP?

[Joe Shen]

which router_id will be used to caculate hash result? 

I come to know that,  packets with the same (src_ip,
dst_ip, src_port, dst_port) will follow the same
routing path, and number of FIB entry is the same as
those in RIB. But, if "simple" is not configured what
entry will be added by HW ? why does IOS do that ?

regards

Joe


> Sup720 supports load-balancing using
> src_ip,dst_ip+universal_router_id and 
> this is the default.
> 
> In this particular case below, you have:
> 
> mls ip cef load-sharing full simple
> 
> 'mls ip cef load-sharing full' lets you use
> 'src_ip,dst_ip+l4 ports' 
> instead of the univeral_router_id
> 
> However, the addition of 'simple' keyword, allows
> hardware to use 
> the same number of adjacencies as in the IOS CEF
> adjacency.
> 
> Without the 'simple' keyword the HW installs
> additional adjacency entries 
> to avoid platform polarization.
> 
> sukumar
> 
> 
> 
> On Mon, 20 Nov 2006, Phil Bedard wrote:
> 
> > That command tells the box to use L4 port
> information in making load
> > balancing
> > decisions.   I think if you just set that back to
> the default it will
> > only use
> > the source/destination hash like you are used to.
> >
> > Phil
> >
> >
> > On Nov 20, 2006, at 9:45 AM, Joe Shen wrote:
> >
> >> mls ip cef load-sharing full simple
> >
> >
> >
> > _______________________________________________
> > cisco-nsp mailing list  cisco-nsp at puck.nether.net
> > https://puck.nether.net/mailman/listinfo/cisco-nsp
> > archive at
> http://puck.nether.net/pipermail/cisco-nsp/
> >
> 



		
___________________________________________________________ 
雅虎免费邮箱-3.5G容量，20M附件 
http://cn.mail.yahoo.com/