[isp-bgp] Re: Routing Information

[haesu@...]

> 	at the same time, your normal static route will take precedence over
> 	anything as long as you use the default/standard a.d. on it.

<pedantic>

	i meant 'take precedence over !connected routes'

</pedantic>

> 
> 	this is just one of the many ways you can use to get around the problem.
> 	ofcourse, YMMV.
> 
> -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
> 
> 
> On Sun, Feb 29, 2004 at 01:09:44AM -0500, Serge Paquin wrote:
> > There is always a catch :)
> > 
> > How would I properly account for redundancy if I'm using HSRP?  2 routers, 2
> > providers connected to an internal switch and connected to each other via
> > crossover.
> > 
> > If a router looses conductivity to the switch along with the other router at
> > the same time and still advertises it's routes there is a blackhole of
> > sorts.
> > 
> > Am I just overanalyzing the problem?  I realize the chance of 2 Ethernet
> > links going down at the same time while the Serial interface of the router
> > is still working is very far fetched. Is it even reasonable to account for
> > such an occurrence?
> > 
> > Serge.
> > 
> > ----- Original Message -----
> > From: "James" <haesu@...>
> > To: <isp-bgp@isp-bgp.com>
> > Sent: Sunday, February 29, 2004 12:58 AM
> > Subject: [isp-bgp] Re: Routing Information
> > 
> > 
> > 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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> ------------------------ANNOUNCEMENT---------------------------------
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>         - ISPCON Spring 2004 - Washington DC Hilton & Towers -
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-- 
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






To unsubscribe via postal mail, please contact us at:
Jupitermedia Corp.
Attn: Discussion List Management
475 Park Avenue South
New York, NY 10016

Please include the email address which you have been contacted with.

------------------------ANNOUNCEMENT---------------------------------
---------------------------------------------------------------------
        - ISPCON Spring 2004 - Washington DC Hilton & Towers -

             - The ISP and WISP event - www.ispcon.com -

              - Informative. Substantive. Instructive -
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