Re: PPPOE with DHCP and VRF + OSPF

Hi Garry,

Thanks a lot. Yes it does work fine.

Just wanted to check if I use unnumbered on virtual interface, is there
still a way that routes are exchanged fine? I mean is there any work around
if any ?

Thanks & Regards,
Gaurav

On Fri, Aug 20, 2010 at 9:15 PM, garry baker <baker.garry_at_gmail.com> wrote:

> try this command on the Client router and you will see the problem:
> 'sh ip ospf database router adv-router 192.168.16.6'
>
> you should see "Adv Router is not-reachable" and you will see a strange
> Router Interface address looking something like 0.0.0.14 (or some number
> that is not an IP on your router or you did not set as router-id under the
> ospf process)
>
> aslo 'show ip ospf int br' and look at the ospf network types, Server will
> be broadcast on the f0/0 and on the Cleint will be p2p on the
> dialer-interface
>
> it is due to the unnumbered interface on the Server you are using:
> interface Virtual-Template1
>
> ip vrf forwarding ABC
> ip unnumbered FastEthernet0/0
>
> change this to the IP of the F0/0 interface and it will start working
>
> see this article for a more detailed explanation:
>
>
> http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a008009481a.shtml#r4
>
> HTH
> garry
>
> --
> Garry L. Baker
>
> "There is no 'patch' for stupidity." - www.sqlsecurity.com
>
>
> On Fri, Aug 20, 2010 at 3:55 PM, Gaurav Thukral <pearlgaurav_at_gmail.com>wrote:
>
>> Hi,
>>
>> I am having a issue with PPPOE using DHCP and PPPOE server interface in
>> VRF,
>> also running OSPF over this PPPOE link. I Just using two router topology (
>> http://www.ccie18473.net/dynamips/dynamips.htm#pppoe-old-dhcp-vrf).
>> I am able to get IP address for dialer interface from DHCP server, also
>> my
>> OSPF session is coming up fine, but the issue is that whereas server is
>> able
>> to get ospf routes from client, client is not having any ospf routes from
>> server.
>>
>> Please if someone take a look and let me know if I am missing something
>> here.
>>
>>
>>
>> Server config :-
>>
>>
>>
>> no ip dhcp use vrf connected
>> ip dhcp excluded-address 192.168.16.2 192.168.16.254
>> !
>> ip dhcp pool PPPOE
>> network 192.168.16.0 255.255.255.0
>> !
>> !
>> ip vrf ABC
>> rd 1:1
>> !
>> ip vrf forwarding
>> !
>> no ip ips deny-action ips-interface
>> vpdn enable
>> !
>> vpdn-group CISCO
>> accept-dialin
>> protocol pppoe
>> virtual-template 16
>>
>> username LAB password 0 LAB
>>
>> interface Loopback0
>> ip vrf forwarding ABC
>> ip address 1.1.1.1 255.255.255.255
>> !
>> interface FastEthernet0/0
>> ip vrf forwarding ABC
>> ip address 192.168.16.6 255.255.255.0
>> duplex auto
>> speed auto
>> pppoe enable
>> !
>>
>> !
>> interface Virtual-Template 1
>> ip vrf forwarding ABC
>> ip unnumbered FastEthernet0/0
>> peer default ip address dhcp-pool PPPOE
>> ppp authentication chap
>> !
>> router ospf 100 vrf ABC
>> log-adjacency-changes
>> network 1.1.1.1 0.0.0.0 area 0
>> network 192.168.16.6 0.0.0.0 area 0
>>
>>
>>
>> Client config :-
>>
>>
>> !
>> interface Loopback0
>> ip address 2.2.2.2 255.255.255.255
>> !
>> interface FastEthernet0/0
>> no ip address
>> duplex auto
>> speed auto
>> pppoe enable
>> pppoe-client dial-pool-number 1
>> !
>> interface Dialer1
>> mtu 1492
>> ip address dhcp
>> encapsulation ppp
>> dialer pool 1
>> no peer neighbor-route
>> ppp chap hostname LAB
>> ppp chap password 0 LAB
>> !
>> router ospf 100
>> log-adjacency-changes
>> network 2.2.2.2 0.0.0.0 area 0
>> network 192.168.16.1 0.0.0.0 area 0
>> !
>>
>>
>>
>> Server side :-
>>
>> Router#sh ip ospf neighbor
>>
>> Neighbor ID Pri State Dead Time Address
>> Interface
>> 192.168.16.1 0 FULL/ - 00:00:35 192.168.16.1
>> Virtual-Access2.1
>> Router#
>>
>> Router#sh ip
>> os
>> Router#sh ip ospf
>> da
>> Router#sh ip ospf
>> database
>>
>> OSPF Router with ID (192.168.16.6) (Process ID 100)
>>
>> Router Link States (Area 0)
>>
>> Link ID ADV Router Age Seq# Checksum Link count
>> 192.168.16.1 192.168.16.1 722 0x8000001D 0x000717 3
>> 192.168.16.6 192.168.16.6 485 0x80000019 0x00D3FF 3
>> Router#
>> Router#sh ip route vr
>> Router#sh ip route vrf ABC
>>
>> Routing Table: ABC
>> Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
>> D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
>> N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
>> E1 - OSPF external type 1, E2 - OSPF external type 2
>> i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS
>> level-2
>> ia - IS-IS inter area, * - candidate default, U - per-user static
>> route
>> o - ODR, P - periodic downloaded static route
>>
>> Gateway of last resort is not set
>>
>> 1.0.0.0/32 is subnetted, 1 subnets
>> C 1.1.1.1 is directly connected, Loopback0
>> 2.0.0.0/32 is subnetted, 1 subnets
>> O 2.2.2.2 [110/2] via 192.168.16.1, 00:08:10, Virtual-Access2.1
>> 192.168.0.0/16 is variably subnetted, 2 subnets, 2 masks
>> S 192.168.16.1/32 is directly connected, Virtual-Access2.1
>> C 192.168.16.0/24 is directly connected, FastEthernet0/0
>> Router#
>>
>>
>> Client Side :-
>>
>> Router#sh ip route
>> Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
>> D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
>> N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
>> E1 - OSPF external type 1, E2 - OSPF external type 2
>> i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS
>> level-2
>> ia - IS-IS inter area, * - candidate default, U - per-user static
>> route
>> o - ODR, P - periodic downloaded static route
>>
>>
>> Gateway of last resort is not set
>>
>> 2.0.0.0/32 is subnetted, 1 subnets
>> C 2.2.2.2 is directly connected, Loopback0
>> 192.168.0.0/24 is subnetted, 1 subnets
>> C 192.168.16.0 is directly connected, Dialer1
>> Router#sh ip ospf nei
>> Router#sh ip ospf neighbor
>>
>> Neighbor ID Pri State Dead Time Address
>> Interface
>> 192.168.16.6 0 FULL/ - 00:00:39 192.168.16.6
>> Dialer1
>> Router#
>>
>> Router#sh ip ospf database
>>
>> OSPF Router with ID (192.168.16.1) (Process ID 100)
>>
>> Router Link States (Area 0)
>>
>> Link ID ADV Router Age Seq# Checksum Link count
>> 192.168.16.1 192.168.16.1 784 0x8000001D 0x000717 3
>> 192.168.16.6 192.168.16.6 550 0x80000019 0x00D3FF 3
>> Router#
>>
>> Thanks & Regards,
>> Gaurav
>>
>>
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Received on Fri Aug 20 2010 - 22:51:53 ART