[Xorp-users] Fwd: Re: virtual link

[Tomek]

Dnia 2 maja 2009 18:52 Tomek <segv at o2.pl> napisał(a):

> Hi,
> Thank you guys for yours replies.
> I use xorp ver. 1.6 at R4,R3 and the rest uses 1.5. 
> So R3 doesn't learn about R4 what is really strange, dunno why..
> Below I listed my config files from R3 and R4:
> 
> ********* R3 ***************
> interfaces {
>     restore-original-config-on-shutdown: false
>     interface eth1 {
>         vif eth1 {
>             address 192.168.2.30 {
>                 prefix-length: 24
>             }
>         }
>     }
>     interface eth2 {
>         vif eth2 {
>             address 192.168.3.30 {
>                 prefix-length: 24
>             }
>         }
>     }
>     interface eth3 {
>         vif eth3 {
>             address 192.168.6.30 {
>                 prefix-length: 24
>             }
>         }
>     }
> }
> 
> fea {
>     unicast-forwarding4 {
>         disable: false
>             forwarding-entries {
>                  retain-on-startup: false
>                retain-on-shutdown: false
>             }
>     }
> }
> protocols {
>         ospf4 {
>                 router-id: 192.168.0.30
> 
>                 area 0.0.0.1 {
>                         interface eth3 {
>                                 vif eth3 {
>                                         address 192.168.6.30 {
>                                                 interface-cost: 2
>                                         }
>                                 }
>                         }
>                 }
> 
>                 area 0.0.0.0 {
> /*                      virtual-link 192.168.0.40 {
>                                 transit-area: 0.0.0.1
>                         }
> */
>                         interface eth1 {
>                                 vif eth1 {
>                                         address 192.168.2.30 {
>                                                 interface-cost: 3
>                                         }
>                                 }
>                         }
>                         interface eth2 {
>                                 vif eth2 {
>                                         address 192.168.3.30 {
>                                                 interface-cost: 1
>                                         }
>                                 }
>                         }
>                 }
>         }
> }
> 
> ********* END ***************
> 
> ********* R4 ***************
> 
> interfaces {
>     restore-original-config-on-shutdown: false
> /*    interface eth1 {
>         description: "Ethernet Interface #1"
>         disable: false
>         default-system-config
>     }
> */
>     interface eth2 {
>         description: "Ethernet Interface #2"
>         disable: false
>         default-system-config
>     }
>     interface eth3 {
>         description: "Ethernet Interface #3"
>         disable: false
>         default-system-config
>     }
> }
> 
> fea {
>     unicast-forwarding4 {
>         disable: false
>             forwarding-entries {
>                  retain-on-startup: false
>                retain-on-shutdown: false
>             }
>     }
> 
> }
> protocols {
>         ospf4 {
>                 router-id: 192.168.0.40
>                 area 0.0.0.1 {
> 
> /*                        interface eth1 {
>                                 vif eth1 {
>                                         address 192.168.4.40 {
>                                                 interface-cost: 4
>                                         }
>                                 }
>                         }
> */
>                         interface eth2 {
>                                 vif eth2 {
>                                         address 192.168.5.40 {
>                                                 interface-cost: 6
>                                          }
>                                 }
>                         }
>                 }
>                 area 0.0.0.3 {
>                         interface eth3 {
>                                 vif eth3 {
>                                         address 192.168.7.40 {
>                                                 interface-cost: 1
>                                          }
>                                 }
>                         }
>                 }
>         }
> }
> 
> 
> ********* END ***************
> 
> ********* R5 ***************
> interfaces {
>     restore-original-config-on-shutdown: false
>     interface eth1 {
>         description: "Ethernet Interface #1"
>         disable: false
>         default-system-config
>     }
>     interface eth2 {
>         description: "Ethernet Interface #2"
>         disable: false
>         default-system-config
>     }
> 
> }
> 
> fea {
>     unicast-forwarding4 {
>         disable: false
>             forwarding-entries {
>                  retain-on-startup: false
>                retain-on-shutdown: false
>             }
>     }
> 
> }
> protocols {
>         ospf4 {
>                 router-id: 192.168.0.50
>                 area 0.0.0.1 {
>                         interface eth1 {
>                                 vif eth1 {
>                                         address 192.168.6.50 {
>                                                 interface-cost: 2
>                                         }
>                                 }
>                         }
>                         interface eth2 {
>                                 vif eth2 {
>                                         address 192.168.5.50 {
>                                                 interface-cost: 6
>                                         }
>                                 }
>                         }
>                 }
> 
>         }
> }
> 
> ********* END ***************
> 
> BR
> Tom
> 
> Dnia 1 maja 2009 18:17 Bruce Simpson  napisał(a):
> 
> > Tomek wrote:
> > > Hi,
> > >
> > > I've got a problem with xorp configuration. 
> > > Actually in my case situation looks like this:
> > >
> > > R3  R5  R4  R6  
> > >
> > > where:
> > >
> > > R3 is an ABR of area 0 (left side) and area 1 (right side)
> > > R5 is internal of area 1
> > > R4 is ABR of area 1(left side) and area 3 (right side)
> > > R6 internal of area 3 
> > >
> > > everything works fine until i want to configure virtual link between R3 and R4
> > > I added virtual-link section to area 0.0.0.0 in ospf4 section
> > >   
> > ...
> > 
> >  * Which version of XORP are you using?
> >  * Which platform are you using XORP on?
> > >                 area 0.0.0.0 {
> > >                         virtual-link 192.168.0.40 {
> > >                                 transit-area: 0.0.0.1
> > >                         }
> > >                        ....
> > > and tried to add virtual-link to R4 without succeed because of error:
> > > Command failed Virtual link must be in area 0.0.0.0
> > >
> > > my question is how to configure virtual link at R4 ?
> > >   
> > 
> > This could be a problem in vlinks traversing area borders, or more 
> > likely, a problem with the lookup by router ID.
> > 
> > I'd have to check this code more fully before I could respond in detail 
> > about that.
> > 
> > The configuration steps you posted look correct, assuming that you are 
> > configuring XORP up on R3.which is an ABR. But is area 1 a transit area 
> > or a stub area? An NSSA area is *not* valid for virtual links, they can 
> > only be configured across transit areas.
> > 
> > More general questions:
> > Does R3 learn about R4 without the virtual-link config?
> > If so, which area(s) does R3 learn that R4 is in?
> > Does R5 see the same topology (neighbours) as R3 and R4?
> > 
> > thanks,
> > BMS
> > 
>