From: Songbin Wei (sbwei_2000@yahoo.com)
Date: Thu Mar 20 2003 - 20:34:45 GMT-3
area 2 virtual-link 11.1.1.1 <---- How can R2 see
11.1.1.1
the ip add following virtual-link is the router id of
an ABR, R2 doesn't have to have route to it. Remember
that router id can be anything, it doesn't have to be
an IP address of some network, just its format is like
ip address...
--- Hunt Lee <ciscoforme3@yahoo.com.au> wrote:
> Hi group,
>
> I'm confused on the following eg.
>
> <--- Area 2 ----->
>
> Trunk VLAN30
> 11.1.1.1---R1 --- Cat 3550 ---- R2---200.200.200.1
> (Area 11) |
> |
> |
> other OSPF routers
> (OSPF Area 0)
>
> R2 is advertising a default route out to OSPF
> by: ip route 0.0.0.0 0.0.0.0 137.20.20.2
>
> Both 11.1.1.1 & 200.200.200.1 are Loopback interface
> by R1 and R2 respectively
>
> I scratched my head as to how can R2 establish a
> virtual-link to R1 with IP
> 11.1.1.1, where 11.1.1.1 is in Area 11, since I was
> expecting that R2 won't be able
> to know about 11.1.1.1 until the Virtual-Link is
> formed...
>
> At R2:-
>
> interface Loopback0
> ip address 200.200.200.1 255.255.255.0
>
> interface Ethernet0
> ip address 137.20.20.1 255.255.255.0
> ip ospf priority 200
>
> router ospf 1
> router-id 200.200.200.1
> log-adjacency-changes
> area 2 virtual-link 11.1.1.1 <---- How can R2
> see 11.1.1.1
> network 137.20.20.1 0.0.0.0 area 2
> network 150.100.32.2 0.0.0.0 area 0
> default-information originate metric 100
> metric-type 1
>
> At R1:-
>
> interface Loopback0
> ip address 11.1.1.1 255.255.255.0
>
> interface FastEthernet0/0.1
> encapsulation dot1Q 10
> ip address 192.168.1.11 255.255.255.224
> !
> interface FastEthernet0/0.2
> encapsulation dot1Q 20
> ip address 10.90.1.11 255.255.255.0
> !
> interface FastEthernet0/0.3
> encapsulation dot1Q 30
> ip address 137.20.20.11 255.255.255.0
> !
> router ospf 1
> router-id 11.1.1.1
> log-adjacency-changes
> area 2 virtual-link 200.200.200.1
> summary-address 192.168.1.0 255.255.255.0
> network 11.1.1.1 0.0.0.0 area 11
> network 137.20.20.11 0.0.0.0 area 2
>
>
> And at 3550:-
>
> interface FastEthernet0/2
> description R2
> switchport access vlan 30
> switchport mode access
> no ip address
>
> interface FastEthernet0/14
> description R1's Trunk port
> switchport trunk encapsulation dot1q
> switchport trunk allowed vlan 1-39,184-4094
> switchport mode trunk
> no ip address
> duplex full
> speed 100
>
> Regards,
> Lee
>
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This archive was generated by hypermail 2.1.4 : Sat Apr 05 2003 - 08:51:42 GMT-3