Re: [isp-bgp] No synchronization

[Erblichs <erblichs@...>]

Khoi Nguyen,

	I'll take a shot at this..

	BGP does not need database synchronization. Also,
	if a route is leaned, it may not want to advertise 
	this route outside the AS.

	Why ? One reason. If the route is say a route with a 
	ISP say A, it may not want to advertise it to B. 

	By doing this, B would not be able to transit traffic 
	thru A's routes.

	in general, internal routes should be advertised 
	ourside the AS, so return traffic won't be blackholded.

	The RIBs decide what route to filter or allow
	to be advertised.

	Mitchell Erblich

	Link state routing protocols (IS-IS, OSPF) (IP routing)
	should have the same routes
	in each of the databases and the willingness to
	take traffic along the path is based on the cost
	metric associated with each direction of the path.
	--------------------------

	

Khoi Nguyen wrote:
> 
> Hello there,
> 
> Not sure what you mean by "and an IGP if the IGP route is installed in the
> forwarding
> table?".  Can you rephrase?
> 
> Thanks,
> khoi
> 
> -----Original Message-----
> From: Thanh_Mai@...mailto:Thanh_Mai@...]
> Sent: Tuesday, November 16, 2004 8:39 AM
> To: isp-bgp@isp-bgp.com
> Subject: [isp-bgp] No synchronization
> 
> Hello,
> Just a quick question:
> With synchronization disabled, does the BGP speaker advertise a route it
> learns via BGP and an IGP if the IGP route is installed in the forwarding
> table?
> I'm confused, because I see Cisco advertising the route, and read that
> Juniper doesn't. Is it up to implementation? or is there a standard on
> this?
> Thanks,
> -Thanh
> 
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