From: Carlos Trujillo (carlos.trujillo.jimenez@gmail.com)
Date: Tue Feb 17 2009 - 23:51:28 ARST
Depending on your IOS version you can also track the rtr (IP SLA) status.
Router(config)#track 1 ?
interface Select an interface to track
ip IP protocol
rtr Response Time Reporter (RTR) entry
As I labbed the result of IP SLA sending tcp probes to port 179 (bgp)
from the local router to the remote isp router, the result of the
probes are FAIL only once the bgp peering connection is estableshied
between both routers, If it is not already established, the probes are
answered and the status is UP.
so I conclude that tracking the status of an already established bgp
session doesnt work, but what about tracking another "not established"
bgp peering between both routers?
Lets supose apart of the already established bgp peering from both
routers, you want to track only that the remote router is capable of
answering tcp 179 probes? meaning it is capable of bgp routing.
IThe last one I labbed and it works fine with IP SLA.
2009/2/17 Hotmail <hussamkibbi@hotmail.com>:
> - Which feature of object tracking I can make it work with session? As I
> know the Ip route one works only with IGP.
> - IP SLA will check only IP reachability but not status of session, right?
> Maybe it's up but session is down.
> - HSRP is not useful in this case?
>
> What if I use static routes to ISP with track and redistributed into BGP,
> any benefit?
>
>
>
> -----Original Message-----
> From: Carlos Trujillo [mailto:carlos.trujillo.jimenez@gmail.com]
> Sent: Wednesday, February 18, 2009 6:18 AM
> To: Hotmail
> Cc: ccielab@groupstudy.com
> Subject: Re: BGP with HSRP failover!
>
> Agree with object tracking + IP SLA sending any kind of probes to the remote
> ISP router, be sure the ISP router is able to reply the probe packet sent by
> the local router.
>
>
> Dont know if there are hosts or routers connected to the lan ports of the
> two border routers, if there are routers instead of hsrp you can make it
> dynamic with an IGP.
>
>
> R&S # 21813.
>
>
>
> 2009/2/17 Hotmail <hussamkibbi@hotmail.com>:
>> Hi Experts,
>>
>> How can I failover from R2 to R1 if EBGP session is down between R2
>> to ISP2 and interface is still up.
>>
>> - 2 edge routers with different ISP each (hsrp), however I need the
>> "active" hsrp router (R2) to fail-over to R1 when R2 looses BGP
>> adjacency with ISP2.
>>
>> DIAGRAM:
>>
>> R1-------EBGP AS x-------ISP1
>> |
>> IBGP AS xxx
>> |
>> R2-------EBGP AS Y-------ISP2
>>
>> Thought about object tracking, but I don't know how much it can work
>> with it?
>>
>> Thanks,
>> Hussam
>>
>>
>> Blogs and organic groups at http://www.ccie.net
>>
>> ______________________________________________________________________
>> _ Subscription information may be found at:
>> http://www.groupstudy.com/list/CCIELab.html
Blogs and organic groups at http://www.ccie.net
This archive was generated by hypermail 2.1.4 : Sun Mar 01 2009 - 09:44:11 ARST