February 9, 2012

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Configuring OSPFv3 for IPv6…Not a big leap.

March 3, 2011 By Leave a Comment

With all the talk about IPv6 I wanted to take the opportunity to show that some things don’t really change. One hinderance I hear from many of my students is that it’s uncharted territory and they are not sure what will happen. In this post I’ve used OSPF to show you that some elements of IPv6 are very similar to that of IPv4.

We can begin with the initial configuration. It may seem like there is a bit of a difference here. In IPv6 there is no “network” command so OSPF is enabled on the interface. Also, the Router ID needs to be defined since it’s still a 32-bit identifier. So globally you need to enable the process and define the router-id, then you enable the protocol on the interface. I’ve done that here:

ipv6 router ospf 1
 router-id 1.1.1.1
 log-adjacency-changes
!
interface FastEthernet0/0
 no ip address
 duplex auto
 speed auto
 ipv6 address 2001:DB8:1:2::1/64
 ipv6 enable
 ipv6 ospf 1 area 0
[Read more...]

Filed Under: CCNP Study, Routing and Switching, Study Tips Tagged With: ,

ipexpert section 16 issue.

October 10, 2008 By 2 Comments

I’m working on IPExpert section 16.  I’ve been working on it for days.  Im making good progress today but have run into an OSPF deal that has me a little stumped.  First off here is a little clip of the topology:

Picture 1 Uploaded with plasq‘s Skitch!

Now here is the config from the routers:

R2:

interface Serial0/1/0
no ip address
encapsulation frame-relay
no frame-relay inverse-arp
frame-relay lmi-type cisco
!
interface Serial0/1/0.4 point-to-point
ip address 192.1.24.2 255.255.255.0
ip access-group IDS_s0/1/0.4_in_0 in
frame-relay interface-dlci 104
!
interface Serial0/1/0.5 point-to-point
ip address 192.1.25.2 255.255.255.0
ip access-group IDS_s0/1/0.5_in_0 in
frame-relay interface-dlci 105
!
interface Serial0/1/0.6 point-to-point
ip address 192.1.26.2 255.255.255.0
frame-relay interface-dlci 106
!
interface Serial0/2/0
no ip address
shutdown
clock rate 2000000
!
interface FastEthernet1/0
no switchport
ip address 192.1.12.2 255.255.255.0
!
!
router ospf 1
router-id 2.2.2.2
log-adjacency-changes
area 10 virtual-link 4.4.4.4
network 2.2.2.2 0.0.0.0 area 0
network 192.1.12.0 0.0.0.255 area 0
network 192.1.24.0 0.0.0.255 area 10
network 192.1.25.0 0.0.0.255 area 0
network 192.1.26.0 0.0.0.255 area 10
!
ip classless
!

R5:

interface Serial0/1/0
ip address 192.1.25.5 255.255.255.0
encapsulation frame-relay
ip ospf network point-to-point
frame-relay map ip 192.1.25.2 501 broadcast
no frame-relay inverse-arp
frame-relay lmi-type cisco
!
interface Serial0/2/0
no ip address
shutdown
!
router eigrp 100
redistribute ospf 1 metric 1 1 1 1 1
network 10.5.5.0 0.0.0.255
no auto-summary
!
router ospf 1
router-id 5.5.5.5
log-adjacency-changes
redistribute eigrp 100 metric 120 subnets
network 5.5.5.5 0.0.0.0 area 0
network 192.1.25.0 0.0.0.255 area 0
network 200.1.1.6 0.0.0.0 area 0
!
ip classless
!
!
ip http server

R4:

interface Serial0/0/0
ip address 192.1.24.4 255.255.255.0
encapsulation frame-relay
ip ospf network point-to-point
frame-relay map ip 192.1.24.2 401 broadcast
no frame-relay inverse-arp
frame-relay lmi-type cisco
!
router ospf 1
router-id 4.4.4.4
no log-adjacency-changes
area 10 virtual-link 2.2.2.2
network 4.4.4.4 0.0.0.0 area 10
network 192.1.24.0 0.0.0.255 area 10
network 192.1.49.0 0.0.0.255 area 10
!
ip classless
!
!
ip http server
no ip http secure-server

R6:

!
interface Serial0/1/0
ip address 192.1.26.6 255.255.255.0
encapsulation frame-relay
ip ospf network point-to-point
--More--
frame-relay map ip 192.1.26.2 601 broadcast
no frame-relay inverse-arp
frame-relay lmi-type cisco
!
interface Serial0/2/0
no ip address
shutdown
clock rate 2000000
!
interface Serial0/2/1
no ip address
shutdown
clock rate 2000000
!
router ospf 1
router-id 6.6.6.6
log-adjacency-changes
redistribute rip metric 120 subnets
network 6.6.6.6 0.0.0.0 area 10
network 192.1.6.0 0.0.0.255 area 10
network 192.1.26.0 0.0.0.255 area 10
!
router rip
version 2
redistribute ospf 1 metric 5
network 172.16.0.0
no auto-summary
!
ip classless
!
!
no ip http server
no ip http secure-server
!
!
!
!
!
control-plane
!
!
!
!
!
!
!
!
!
!
line con 0
exec-timeout 0 0
line aux 0
line vty 0 4
login
!
warm-reboot
scheduler allocate 20000 1000
!
end
What I’m having an issue with is that R4 and R6 keep getting the virtual-link error but they shouldn’t be seeing R5 in the first place. Only R2 should have R5 as a neighbor. 
*Oct 10 18:18:53.238: %OSPF-4-ERRRCV: Received invalid packet: 
mismatch area ID, from backbone area must be virtual-link but not 
found from 192.1.25.5, S 
What am I missing here?

Filed Under: CCIE Security, IPExpert Labs Tagged With: , , ,