[j-nsp] ospf virtual link and rsvp lsp

Wed Aug 11 18:34:48 EDT 2004

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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