Re: How to advertise ethernet IP as /32 in BGP

Hi Adam/All,

Thank you for the reply & the configuration.
Sorry, I am bit new to PPPoE configurations.

It seems we need to get the PPPoE between the 2 routers. Yes, I see it
is working. In my setup, I am looking a way to originate this /32
within the router itself as this is required on a CE router connecting
to a PE. It is not very easy to make PPPoE configurations on a PE
router.

Anyway, I will further study your configuration & also will see others
reply if any more.

Regards,

Mathew

On Thu, Mar 31, 2011 at 11:19 PM, Adam Means <adam.means_at_gmail.com> wrote:
> Matthew,
>
> PPPoE w/ ip unnumbered works as described so see if this answers your
> question. You need to apply the /32 to the loopback and then apply ip
> unnumbered loopbackX to the virtual-template interface and respective client
> dialer interface. Running 12.4 and it'd be something along lines of:
>
> R1:f0/0 <---> R2:f0/0
>
> R1:
> bba-group pppoe global
> virtual-template 1
> int lo0
> ip add 1.1.1.1 255.255.255.255
> interface virtual-te1
> ip unnumbered lo0
> interface f0/0
> pppoe enable group global
> router bgp 12
> neighbor 2.2.2.2 remote 12
> network 1.1.1.1 mask 255.255.255.255
> network 2.2.2.2 mask 255.255.255.255
>
> R2:
> interface dialer1
> mtu 1492
> ip unnumbered lo0
> encap ppp
> dialer pool 1
> dialer persistent
> interface f0/0
> pppoe enable
> pppoe-client dial-pool-number 1
> router bgp 12
> neighbor 1.1.1.1 remote 12
> network 2.2.2.2 mask 255.255.255.255
> network 1.1.1.1 mask 255.255.255.255
>
>
>
> R1(config-router)#do sh bgp ipv4 uni
> BGP table version is 6, local router ID is 1.1.1.1
> Status codes: s suppressed, d damped, h history, * valid, > best, i -
> internal,
> r RIB-failure, S Stale
> Origin codes: i - IGP, e - EGP, ? - incomplete
>
> Network Next Hop Metric LocPrf Weight Path
> * i1.1.1.1/32 2.2.2.2 0 100 0 i
> *> 0.0.0.0 0 32768 i
> * i2.2.2.2/32 2.2.2.2 0 100 0 i
> *> 0.0.0.0 0 32768 i
>
> R1(config-router)#do 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
>
> 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
> C 2.2.2.2 is directly connected, Virtual-Access1.1
>
>
>
>
> On Thu, Mar 31, 2011 at 12:38 AM, Mathew <mathewfer_at_gmail.com> wrote:
>>
>> Hi Jules,
>>
>> Thank you again for your reply & testing it.
>>
>> How did you get the loopback configured with the same IP as Ethernet
>> with /32 mask.
>> For me, I can not get the loopback. Did you have the Ethernet also
>> with the same address but different mask - like 24. See below.
>> I think if I can get the loopback interface configured, we can
>> advertise it straight in BGP. Is'n it?
>>
>> What am I missing here?
>>
>> Please check your configuration again for me, how you tested it & let
>> us see your full config with the IOS ver tested.
>>
>> Thank you again for your reply.
>>
>> R2#sho runn int fast 0/0
>> Building configuration...
>>
>> Current configuration : 530 bytes
>> !
>> interface FastEthernet0/0
>> ip address 10.100.40.2 255.255.255.0
>> end
>>
>> R2#conf t
>> Enter configuration commands, one per line. End with CNTL/Z.
>> R2(config)#int loopback 44
>> R2(config-if)#ip address 10.100.40.2 255.255.255.255
>> % 10.100.40.2 overlaps with FastEthernet0/0
>> R2(config-if)#
>>
>> Regards,
>>
>> Mathew
>>
>> On Thu, Mar 31, 2011 at 11:47 AM, jules NYA BAWEU <nyabaweu_at_gmail.com>
>> wrote:
>> > Can you try getting around with the PPPOE client config?
>> >
>> > loo100 -- > 10.100.40.2 255.255.255.255
>> > dialer 1 -- > unnumbered loo100
>> > then link fa0/0 to the dialer pool
>> >
>> > You should then use the /32 network in statement in the BGP section.
>> >
>> > I just tried it and able to advertise the /32. Sorry if I missed some
>> > details in you requirement
>> >
>> > On Wed, Mar 30, 2011 at 5:33 PM, Mathew <mathewfer_at_gmail.com> wrote:
>> >>
>> >> Hi Aaron,
>> >>
>> >> Thank you for the reply.
>> >>
>> >> No, I did not try because I am trying to find a way to get /32. Reason
>> >> is that this project involve many routers & we are limited with IPs.
>> >>
>> >> Any more ideas?
>> >>
>> >>
>> >> Mathew
>> >>
>> >>
>> >> On Thu, Mar 31, 2011 at 10:52 AM, Aaron <aaron1_at_gvtc.com> wrote:
>> >> > You tried a /31?
>> >> >
>> >> > Aaron
>> >> >
>> >> > On Mar 30, 2011, at 6:21 PM, Mathew <mathewfer_at_gmail.com> wrote:
>> >> >
>> >> >> Hi Hubert/All,
>> >> >>
>> >> >> I tried the sub-interface options you suggested but it did not work,
>> >> >> see below. I tried before to enter /32 IP under main Ethernet
>> >> >> interface & it did not take /32 IP & it seems same with a
>> >> >> sub-interface too.
>> >> >>
>> >> >> Any other ideas are welcome as I have ran out of options but I
>> >> >> believe
>> >> >> there should be a way to do this too.
>> >> >>
>> >> >> R2(config)#int FastEthernet0/0.1
>> >> >>
>> >> >> R2(config-subif)#encapsulation dot1Q 1
>> >> >> R2(config-subif)#ip address 2.2.2.2 255.255.255.255
>> >> >> Bad mask /32 for address 2.2.2.2
>> >> >> R2(config-subif)#ip address 2.2.2.2 255.255.255.252
>> >> >> R2(config-subif)#do sho runn int FastEthernet0/0.1
>> >> >> Building configuration...
>> >> >>
>> >> >> Current configuration : 101 bytes
>> >> >> !
>> >> >> interface FastEthernet0/0.1
>> >> >> encapsulation dot1Q 1 native
>> >> >> ip address 2.2.2.2 255.255.255.252
>> >> >> end
>> >> >>
>> >> >> R2(config-subif)#
>> >> >>
>> >> >> Regards
>> >> >>
>> >> >> Mathew
>> >> >>
>> >> >>
>> >> >>
>> >> >> On Thu, Mar 31, 2011 at 9:33 AM, Hubert Hinsley
>> >> >> <hubert.hinsley_at_gmail.com> wrote:
>> >> >>> Hello, would it be possible to achieve the solution via
>> >> >>> subinterfaces
>> >> >>> on the
>> >> >>> router ethernet interface? One with a /32 address and one with a
>> >> >>> /24?
>> >> >>> Or,
>> >> >>> possibly via primary and secondary ip addresses on the same
>> >> >>> interface?
>> >> >>> Apologies if I have misunderstood the question.Regards, Hubert.
>> >> >>>
>> >> >>> On 30 Mar 2011 20:53, "Mathew" <mathewfer_at_gmail.com> wrote:
>> >> >>>
>> >> >>> Hi Stephen,
>> >> >>>
>> >> >>> Thank you for the reply.
>> >> >>> Yes, I need to be advertise in BGP. So unfortunately, PPP idea can
>> >> >>> not
>> >> >>> be used here.
>> >> >>>
>> >> >>> Mathew
>> >> >>>
>> >> >>> On Wed, Mar 30, 2011 at 6:32 AM, Narbik Kocharians
>> >> >>> <narbikk_at_gmail.com>
>> >> >>> wrote:
>> >> >>>> Mathew,
>> >> >>>>
>> >> >>>> Does it...
>> >> >>>
>> >> >>>> Sr. Technical Instructor
>> >> >>>> Ask about our FREE Lab Voucher with our Boot Camps
>> >> >>>> YES! We take Cisco...
>> >> >>>
>> >> >>> --
>> >> >>>
>> >> >>> Thanks
>> >> >>>
>> >> >>> Mathew
>> >> >>>
>> >> >>>
>> >> >>> Blogs and organic groups at http://www.ccie.net
>> >> >>>
>> >> >>> __________________________________...
>> >> >>
>> >> >>
>> >> >>
>> >> >> --
>> >> >> Thanks
>> >> >>
>> >> >> Mathew
>> >> >>
>> >> >>
>> >> >> Blogs and organic groups at http://www.ccie.net
>> >> >>
>> >> >>
>> >> >> _______________________________________________________________________
>> >> >> Subscription information may be found at:
>> >> >> http://www.groupstudy.com/list/CCIELab.html
>> >> >>
>> >> >>
>> >> >>
>> >> >>
>> >> >>
>> >> >>
>> >> >>
>> >> >
>> >>
>> >>
>> >>
>> >> --
>> >> Thanks
>> >>
>> >> Mathew
>> >>
>> >>
>> >> Blogs and organic groups at http://www.ccie.net
>> >>
>> >> _______________________________________________________________________
>> >> Subscription information may be found at:
>> >> http://www.groupstudy.com/list/CCIELab.html
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >
>> >
>>
>>
>>
>> --
>> Thanks
>>
>> Mathew
>>
>>
>> Blogs and organic groups at http://www.ccie.net
>>
>> _______________________________________________________________________
>> Subscription information may be found at:
>> http://www.groupstudy.com/list/CCIELab.html
>>
>>
>>
>>
>>
>>
>>
>
>

-- 
Thanks
Mathew
Blogs and organic groups at http://www.ccie.net