Re: Advertising local host routes in BGP?

Hmm, I don't know what the problem is. All the info you send now seems
ok. Can you provide a small configuration set that we can use to
reproduce the issue ?
If this is related to the doc you referred before, your FIB would be
inconsistent with your RIB, which is not the case in the provided
show ooutputs.

-Carlos

Jeffrey Pazahanick @ 20/4/2010 11:30 -0300 dixit:
> That doesn't seem to work either...
>
> ip route 1.1.1.5 255.255.255.255 1.1.1.5
>
>
> R1#sh ip cef 1.1.1.5 det
> 1.1.1.5/32, version 37, epoch 0
> 0 packets, 0 bytes
> via 1.1.1.5, 0 dependencies, recursive
> unresolved
>
> R1#sh arp
> Protocol Address Age (min) Hardware Addr Type Interface
> Internet 1.1.1.1 - 0015.fa64.6d21 ARPA FastEthernet0/1
> Internet 1.1.1.5 16 0015.fa64.7b13 ARPA FastEthernet0/1
> Internet 10.1.12.1 - 0015.fa64.6d20 ARPA FastEthernet0/0
> Internet 10.1.12.2 16 0015.fa64.7518 ARPA FastEthernet0/0
>
> R1#sh ip route 1.1.1.5
> Routing entry for 1.1.1.5/32
> Known via "static", distance 1, metric 0
> Advertised by bgp 1
> Routing Descriptor Blocks:
> * 1.1.1.5
> Route metric is 0, traffic share count is 1
>
> ----
>
> Remove the static.
>
> R1#conf t
> Enter configuration commands, one per line. End with CNTL/Z.
> R1(config)#no ip route 1.1.1.5 255.255.255.255 1.1.1.5
> R1(config)#^Z
> R1#ping
> *Apr 20 14:29:07.057: %SYS-5-CONFIG_I: Configured from console by console
> R1#ping 1.1.1.5
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 1.1.1.5, timeout is 2 seconds:
> !!!!!
> Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
> R1#sh ip cef 1.1.1.5 det
> 1.1.1.0/24, version 32, epoch 0, attached, connected
> 0 packets, 0 bytes
> via FastEthernet0/1, 0 dependencies
> valid glean adjacency
> R1#sh arp
> Protocol Address Age (min) Hardware Addr Type Interface
> Internet 1.1.1.1 - 0015.fa64.6d21 ARPA FastEthernet0/1
> Internet 1.1.1.5 19 0015.fa64.7b13 ARPA FastEthernet0/1
> Internet 10.1.12.1 - 0015.fa64.6d20 ARPA FastEthernet0/0
> Internet 10.1.12.2 19 0015.fa64.7518 ARPA FastEthernet0/0
> R1#sh ip route 1.1.1.5
> Routing entry for 1.1.1.0/24
> Known via "connected", distance 0, metric 0 (connected, via interface)
> Routing Descriptor Blocks:
> * directly connected, via FastEthernet0/1
> Route metric is 0, traffic share count is 1
>
>
> Any other suggestions?
>
> On Sat, Apr 17, 2010 at 6:57 AM, Carlos G Mendioroz <tron_at_huapi.ba.ar> wrote:
>> Send it to the destination:
>>
>> ip route 1.1.1.5 255.255.255.255 1.1.1.5
>>
>> That worked in a couple of versions I tested it. I did no other test,
>> so I don't know if it fixes your issue, but it may help.
>>
>> -Carlos
>>
>>
>> Jeffrey Pazahanick @ 17/04/2010 1:33 -0300 dixit:
>>> Carlos,
>>>
>>> How do you have a static /32 pointed to the segment if you are the next hop?
>>>
>>> R1#conf t
>>> Enter configuration commands, one per line. End with CNTL/Z.
>>> R1(config)#ip route 1.1.1.5 255.255.255.255 1.1.1.1
>>> %Invalid next hop address (it's this router)
>>> R1(config)#R1#conf t
>>>
>>>
>>> On Fri, Apr 16, 2010 at 5:10 PM, Carlos G Mendioroz <tron_at_huapi.ba.ar> wrote:
>>>> Interesting reading (the loop problem).
>>>> Caused by a floating static route to a multipoint if.
>>>>
>>>> You say:
>>>>> The link says the solution is to point the statics to the next hop;
>>>>> which I can't, as they are local.
>>>> which triggered me to try it. And it works.
>>>>
>>>> You can have a static /32 route to a next hop which is in a connected
>>>> segment. Which solves your need for a given /32 prefix to be published
>>>> by BGP w/o the burden of proxy ARP poisoning your CEF adjacency table...
>>>>
>>>> -Carlos
>>>>
>>>>
>>>>
>>>> Jeffrey Pazahanick @ 16/04/2010 0:37 -0300 dixit:
>>>>> I have a situation where I'm trying to advertise only 4 host routes
>>>>> from a /24 network to my BGP neighbors.
>>>>> As an example,
>>>>>
>>>>> #R1
>>>>> interface g0/0
>>>>> ip addr 1.1.1.2 255.255.255.0
>>>>> standby ip 1.1.1.1
>>>>>
>>>>> router bgp 1
>>>>> network 1.1.1.4 mask 255.255.255.255
>>>>> network 1.1.1.5 mask 255.255.255.255
>>>>> network 1.1.1.7 mask 255.255.255.255
>>>>> network 1.1.1.9 mask 255.255.255.255
>>>>>
>>>>> With a single router, a static route to the interface worked fine..
>>>>>
>>>>> ip route 1.1.1.4 255.255.255.255 g0/0
>>>>> ip route 1.1.1.5 255.255.255.255 g0/0
>>>>> ip route 1.1.1.7 255.255.255.255 g0/0
>>>>> ip route 1.1.1.9 255.255.255.255 g0/0
>>>>>
>>>>> When adding a redundant router, things initially work as well..
>>>>>
>>>>> #R2
>>>>> interface g0/0
>>>>> ip addr 1.1.1.3 255.255.255.0
>>>>> standby ip 1.1.1.1
>>>>>
>>>>> router bgp 1
>>>>> network 1.1.1.4 mask 255.255.255.255
>>>>> network 1.1.1.5 mask 255.255.255.255
>>>>> network 1.1.1.7 mask 255.255.255.255
>>>>> network 1.1.1.9 mask 255.255.255.255
>>>>>
>>>>> ip route 1.1.1.4 255.255.255.255 g0/0
>>>>> ip route 1.1.1.5 255.255.255.255 g0/0
>>>>> ip route 1.1.1.7 255.255.255.255 g0/0
>>>>> ip route 1.1.1.9 255.255.255.255 g0/0
>>>>>
>>>>> The issue arises when R1 fails, R2 has a CEF routing loop..
>>>>>
>>>>> Troubleshooting Cisco Express Forwarding Routing Loops
>>>>> Document ID: 26083
>>>>> http://www.cisco.com/en/US/partner/tech/tk827/tk831/technologies_tech_note09186a00800cdf2e.shtml
>>>>>
>>>>> The link says the solution is to point the statics to the next hop;
>>>>> which I can't, as they are local.
>>>>>
>>>>> Is there another way to advertise these host routes?
>>>>>
>>>>> I've been trying to use inject-maps, but my own routers are the route
>>>>> source, and it doesn't appear to work.
>>>>>
>>>>> Ideas?
>>>>>
>>>>>
>>>>> Blogs and organic groups at http://www.ccie.net
>>>>>
>>>>> _______________________________________________________________________
>>>>> Subscription information may be found at:
>>>>> http://www.groupstudy.com/list/CCIELab.html
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>> --
>>>> Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina
>>>>
>> --
>> Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina
>>

-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net