[j-nsp] ospf virtual link and rsvp lsp

Gary Tate gtate at juniper.net
Wed Aug 11 18:54:12 EDT 2004 

I will let you keep your dialog with Raymond about the technical  
aspects but would like to tell you that I have raised the problem with  
Juniper Tech Pubs and will raise a doc bug accordingly.

Thanks for pointing out the problem with the documentation.
Gary

On Aug 11, 2004, at 3:34 PM, Raymond Cheh wrote:

> That's true, the RSVP config is not there. You have to configure it
> separately. But you don't need to configure any rsvp lsp if you'd  
> rather
> keep configuration simpler.
>
>
>
> Are you trying to set up the virtual link with an lsp? Or are you  
> trying
> to set up an ospf virtual link with minimal config? It seems that you
> have some design in mind that you want to plan the configuration. If  
> you
> give me more details, I may be able to send you some sample
> configurations.
>
>
>
> Thanks.
>
>
>
> Raymond
>
>
>
> ________________________________
>
> From: R Che [mailto:jlablab at yahoo.com]
> Sent: Wednesday, August 11, 2004 3:23 PM
> To: Raymond Cheh; juniper-nsp at puck.nether.net
> Subject: RE: [j-nsp] ospf virtual link and rsvp lsp
>
>
>
> but the example on that page doesn't use rsvp lsp at all. is it missing
> on the page or it's done automatically?
>
>
> Raymond Cheh <rcheh at juniper.net> wrote:
>
> 	Ah, I see where you got the page now. The one I quoted is in the
> OSPF Overview and the
>
> 	one here is in the OSPF Configuration Guideline section.
>
> 	
>
> 	The short answer is no, you don't need rsvp lsp to set up the
> virtual-link as long as
>
> 	the end-points are reachable between the 2 routers.
>
> 	
>
> 	Having an lsp allows you to control the path the virtual-link is
> set up because
>
> 	with the lsp between the 2 routers of the virtual-link
> endpoints, it provides the
>
> 	most direct path for the virtual-link to go through.
>
> 	
>
> 	Hope this helps.
>
> 	
>
> 	Raymond
>
> 		-----Original Message-----
> 		From: R Che [mailto:jlablab at yahoo.com]
> 		Sent: Wednesday, August 11, 2004 10:40 AM
> 		To: jlablab at yahoo.com; Raymond Cheh;
> juniper-nsp at puck.nether.net
> 		Subject: RE: [j-nsp] ospf virtual link and rsvp lsp
>
> 		This is the page copied from the pdf. Is virtual-link
> really done by using rsvp lsp? I thought this is something related to
> setting v-bit (virtual-link endpoint) on OSPF etc..
>
> 		
>
> 		Configure an RSVP LSP
>
> 		If any router on the backbone is not physically
> connected to the backbone itself, you must
>
> 		establish a virtual connection between that router and
> the backbone. You can establish a
>
> 		virtual connection between area border routers by
> configuring an RSVP LSP.
>
> 		To configure an RSVP LSP for OSPF, include the
> virtual-link statement when configuring the
>
> 		backbone area (area 0):
>
> 		[edit protocols ospf area 0.0.0.0]
>
> 		virtual-link neighbor-id router-id transit-area area-id;
>
> 		To configure an RSVP LSP for OSPFv3, include the
> virtual-link statement when configuring the
>
> 		backbone area (area 0):
>
> 		[edit protocols ospf3 area 0.0.0.0]
>
> 		virtual-link neighbor-id router-id transit-area area-id;
>
> 		For a list of hierarchy levels at which you can
> configure this statement, see the statement
>
> 		summary section for this statement.
>
> 		Specify the router ID (as an IPv4 address) of the router
> at the other end of the LSP. This router
>
> 		must be an area border router that is physically
> connected to the backbone. Also, specify the
>
> 		number of the area through which the LSP transits.
>
> 		For the virtual connection to work, you also must
> configure a LSP to the backbone area on
>
> 		the remote area border router (the router at the other
> end of the LSP).
>
> 		Example: Configure an RSVP LSP
>
> 		Configure an RSVP LSP on the local router. This router
> must be an area border router that is
>
> 		physically connected to the backbone.
>
> 		[edit protocols ospf]
>
> 		area 0.0.0.0 {
>
> 		virtual-link neighbor-id 192.168.0.3 transit-area
> 1.1.1.1;
>
> 		interface t3-1/0/0 {
>
> 		hello-interval 1;
>
> 		dead-interval 3;
>
> 		}
>
> 		}
>
> 		You must also configure an LSP on the remote area border
> router:
>
> 		[edit protocols ospf]
>
> 		area 0.0.0.0 {
>
> 		virtual-link neighbor-id 192.168.0.5 transit-area
> 1.1.1.1;
>
> 		}
>
> 		
> 		
> 		R Che <jlablab at yahoo.com> wrote:
>
> 			The guide is for JunOS 6.2. So I believe this
> must be corrected in latest release?
> 			
> 			Raymond Cheh wrote:Which JunOS release is this
> guide? I checked both 6.0 and 6.4 and I think
> 			the passage to which you refer is this one:
> 			
> 			Backbone Areas
> 			
> 			An OSPF backbone area consists of all networks
> in area ID 0.0.0.0, their attached routers, and all area border  
> routers.
> The backbone itself does not have any area border routers. The backbone
> distributes routing information between areas. The backbone is simply
> another area, so the terminology and rules of areas apply: a router  
> that
> is directly connected to the backbone is an internal router on the
> backbone, and the backbone's topology is hidden from the other areas in
> the AS.
> 			
> 			The routers that make up the backbone must be
> physically contiguous. If they are not, you must configure virtual  
> links
> to! ! create the appearance of backbone connectivity. You can create
> virtual links between any two area border routers that have an  
> interface
> to a common nonbackbone area. OSPF treats two routers joined by a
> virtual link as if they were connected to an unnumbered point-to-point
> network.
> 			
> 			** End of excerpt **
> 			
> 			In this case, the virtual link is to connect the
> backbone area so that it
> 			becomes one.
> 			
> 			Please let me know if you have further
> questions. Thanks.
> 			
> 			Raymond
> 			rcheh at juniper.net
> 			
> 			
> 			-----Original Message-----
> 			From: juniper-nsp-bounces at puck.nether.net on
> behalf of R Che
> 			Sent: Tue 8/10/2004 4:41 PM
> 			To: juniper-nsp at puck.nether.net
> 			Subject: [j-nsp] ospf virtual link and rsvp lsp
> 			
> 			On JunOS Routing Protocol Configuration Guid
> page 284, it says "you can establish a virtual connection between area
> border routers by configuring an RSVP LSP". In the rest of this page,  
> it
> says about virtual link, and I can't think of any relation between a  
> RS!
> ! VP LSP and virtual link?
> 			
> 			
> 			
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