Re: monitor P router loopback address

For an example, consider this topology:

CE1---s1/1[PE1]---P

CE1-PE1: 200.0.0.1 and .2
PE-P: 200.0.0.5 and .6
CE1 belongs to a VRF, and it has a default route pointing to PE1.
P's Loopback is 100.0.0.2

On PE1 add 2 routes:

! This is so CE1's traffic gets routed to P1
ip route vrf VPNA 100.0.0.2 255.255.255.255 200.0.0.6 global
! This is so PE1 can route the return traffic back to the VRF (notice it is
the connected interface in the VRF)
ip route 200.0.0.0 255.255.255.252 Serial1/1

On P add this route:

ip route 200.0.0.0 255.255.255.252 200.0.0.5

Now CE1 can communicate with P1:

CE1#ping 100.0.0.2

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 100.0.0.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 12/32/84 ms
CE1#

On Thu, Jul 2, 2009 at 8:38 AM, Bryan Bartik <bbartik_at_ipexpert.com> wrote:

> Take a look here:
>
> *
> http://www.cisco.com/en/US/tech/tk436/tk832/technologies_configuration_example09186a0080231a3e.shtml
> *
>
>
> 2009/7/2 Alex H. Ryu <r.hyunseog_at_ieee.org>
>
>> I don't think so.
>> Routing should be bi-directional, and if it happens, it is security
>> issue for VRF.
>> Between VRFs, using import/export RT, it can share routes between
>> different VRFs if you carefully design it.
>> But not with Global Default routing table.
>>
>> Alex
>>
>>
>>
>> Bhuvanesh Rajput wrote:
>> > Hi,
>> >
>> > If routes are in Global Routing table...can't these be injected in
>> vrf....??
>> >
>> > Brgds
>> > Bhuvanesh
>> >
>> >
>> > On Thu, Jul 2, 2009 at 3:03 PM, jack daniels<jckdaniels12_at_gmail.com>
>> wrote:
>> >
>> >> Hi,
>> >>
>> >> P router has loopback and has no vrf , so it belongs to Default global
>> >> routing table.
>> >>
>> >> Regards
>> >>
>> >>
>> >>
>> >> 2009/7/2 Alex H. Ryu <r.hyunseog_at_ieee.org>
>> >>
>> >>
>> >>> What routing table does loopback ip address belong to ?
>> >>>
>> >>> VRF stands for Virtual Routing and Forwarding instance.
>> >>> Between VRFs, you may import/expot routing table to share the
>> connectivity.
>> >>>
>> >>> But if loopback ip address are belong to Default_Routing table, which
>> is
>> >>> not VRF,
>> >>> I don't think so.
>> >>>
>> >>> Alex
>> >>>
>> >>>
>> >>> jack daniels wrote:
>> >>>
>> >>>> Hi group ,
>> >>>>
>> >>>> I have a vrf X and I'm monitoring the LOOPBACKs of PE routers , now
>> to
>> >>>> monitor P routers how can we make it ......
>> >>>> Monitoring is done on a server which is connected on VRF X
>> >>>>
>> >>>> Regards
>> >>>> J.Daniels
>> >>>>
>> >>>>
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>> >>>>
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>
>
> --
> Bryan Bartik
> CCIE #23707 (R&S), CCNP
> Sr. Support Engineer - IPexpert, Inc.
> URL: http://www.IPexpert.com
>

-- 
Bryan Bartik
CCIE #23707 (R&S), CCNP
Sr. Support Engineer - IPexpert, Inc.
URL: http://www.IPexpert.com
Blogs and organic groups at http://www.ccie.net