[isp-bgp] Re: Routing Information

[James <haesu@...>]

	yes you are missing something.. :P

	if the router doesnt see the route and drops the bgp advertisement..
	that's all fine and dandy... but...

	now what happens if your ethernet starts flapping hard? you are going
	to start flapping bgp advertisements. now that might not be a problem
	for you if this is bgp over an internal network that does not propagate
	the advertisements to the internet.. but if this is a live bgp session
	with your upstream isp and what not, you are going to experience some
	serious dampening penalties after enough flaps.

	flapping leads to dampening.
	dampening leads to suffering.

	besides... if the route becomes unavailable, it can be safely routed to
	bitbucket anyway.

	my 0.02

-J

-- 
James Jun (formerly Haesu)
TowardEX Technologies, Inc.
1740 Massachusetts Ave.
Boxborough, MA 01719
Consulting, IPv4 & IPv6 colocation, web hosting, network design & implementation
http://www.towardex.com  | james@towardex.com
Cell: (978)394-2867      | Office: (978)263-3399 Ext. 170
Fax: (978)263-0033       | AIM: GigabitEthernet0
NOC: http://www.twdx.net | POC: HAESU-ARIN, HDJ1-6BONE

On Sun, Feb 29, 2004 at 12:54:08AM -0500, Serge Paquin wrote:
> Thanks for the quick reply.
> 
> Actually I'm thinking about not having the floating route.  If the router
> cannot see the internal switch and it's local neighbor router it has nowhere
> to send the traffic so I figure it should not be advertising.
> 
> I see everyone always recommending a floating route but I figure that could
> give me a type of local blackhole.
> 
> Am I missing something?
> 
> Serge.
> 
> ----- Original Message -----
> From: "James" <haesu@...>
> To: <isp-bgp@isp-bgp.com>
> Sent: Sunday, February 29, 2004 12:49 AM
> Subject: [isp-bgp] Re: Routing Information
> 
> 
> >     If there is no static route to a locally BGP advertised block BGP will
> > not advertise?
> 
> correct.
> 
> thats why you can either a) advertise a connected route or
> b) set a floating static route.
> 
> >     ie:
> >     route1 advertises 192.168.0.0/24 via BGP
> 
> i.e. do this:
> 
> conf t
> router bgp blah
> network 192.168.0.0 mask 255.255.255.0
> exit
> ip route 192.168.0.0 255.255.255.0 192.168.1.1
> ip route 192.168.0.0 255.255.255.0 192.168.2.1 50
> ! The floating route to null.
> ip route 192.168.0.0 255.255.255.0 Null0 254
> 
> can also use 'permanent' as well.
> 
> -J
> 
> --
> James Jun (formerly Haesu)
> TowardEX Technologies, Inc.
> 1740 Massachusetts Ave.
> Boxborough, MA 01719
> Consulting, IPv4 & IPv6 colocation, web hosting, network design &
> implementation
> http://www.towardex.com  | james@towardex.com
> Cell: (978)394-2867
> Fax: (978)263-0033       | AIM: GigabitEthernet0
> NOC: http://www.twdx.net | POC: HAESU-ARIN, HDJ1-6BONE
> 
> >
> >     static route:
> >     ip route 192.168.0.0 255.255.255.0 192.168.1.1
> >     ip route 192.168.0.0 255.255.255.0 192.168.2.1 50
> >
> >     If the router looses it's like to the 192.168.1.0 and 192.168.2.0
> > networks the static routes become invalid and theirfore the router will
> stop
> > advertising 192.168.0.0/24 via BGP?
> >
> > Thanks,
> > Serge.
> >
> >
> >




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