08-19-2010 09:34 PM - edited 03-04-2019 09:29 AM
I'm migrating the configuration from a Cisco 12416 router running Cisco IOS, to a CRS1 router running IOS-XR.
In IOS I have configured the following command for FRR "ip rsvp signalling hello bfd". I cannot find the way to configure this parameter using IOS-XR.
I don't know if anyone can help me with this request.
Thanks.
Jose.
Solved! Go to Solution.
08-19-2010 10:32 PM
In IOS-XR BFD triggered FRR is enabled under the mpls traffic-eng configuration mode. A sample is:
mpls traffic-eng
interface POS0/0/0/0
backup-path tunnel-te XXXX
bfd fast-detect
!
bfd minimum-interval 150
bfd multiplier 3
!
I will suggest you read the IOS-XR BFD configuration guide just to get up to speed with the details:
http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.6/interfaces/configuration/guide/hc36bifw.html (Release 3.6 ... You can find this for subsequent releases on Cisco's website as well using the master link http://www.cisco.com/en/US/products/ps5845/products_installation_and_configuration_guides_list.html)
Atif
08-19-2010 10:32 PM
In IOS-XR BFD triggered FRR is enabled under the mpls traffic-eng configuration mode. A sample is:
mpls traffic-eng
interface POS0/0/0/0
backup-path tunnel-te XXXX
bfd fast-detect
!
bfd minimum-interval 150
bfd multiplier 3
!
I will suggest you read the IOS-XR BFD configuration guide just to get up to speed with the details:
http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.6/interfaces/configuration/guide/hc36bifw.html (Release 3.6 ... You can find this for subsequent releases on Cisco's website as well using the master link http://www.cisco.com/en/US/products/ps5845/products_installation_and_configuration_guides_list.html)
Atif
08-20-2010 08:26 AM
Thanks a lot for your help Atif.
I will test the configuration in my lab environment and post the results.
Thanks again for your help.
Jose
09-21-2011 12:52 PM
Hi,
and results?
How was the test and have you got sub-second failover?
I am trying to achieve fast convergence with IP fast reroute (IP FRR) without MPLS TE.
The problem is that I don't know how to test it. With ICMP I don't get any packets lost when I shut down the interface
that is forwarding the traffic. But I don't know how to find out the time for reconvergence.
I am using BFD, too, but looks like that I get the same failover time without BFD.
The OSPF timers are these on CRS8 IOS-XR 4.0.3:
timers throttle lsa all 0 20 5000
timers throttle spf 24 24 5000
timers lsa min-arrival 20
09-22-2011 11:25 PM
Hello,
I you want convergence times of 10-20ms you need MPLS TE.
we also change OSPF timers to have fast IGP convergence, this is the configuration we use based on Cisco recommendations:
!
router ospf
ispf
nsf ietf
mpls ldp sync
timers throttle lsa all 0 20 5000
timers throttle spf 50 50 5000
timers lsa arrival 15
timers pacing flood 15
!
mpls ldp igp sync holddown 60000
!
hope this helps.
09-22-2011 11:37 PM
Thank you for the config.
We have similar timers, but I deleted timers pacing flood because I read that it is not recommended to change it.
Do you lose a packet after a failover? When I do an ICMP test and after I administravly shut down the forwarding interface no packets get lost, but when I simulate a link down so that I shut down the interface on the other side I lose one packet.
Maybe my understanding of sub-second convergence is wrong, maybe it is ok that a packet gets lost!
OSPF needs only 28msec to steer the traffic over the backup path but I can not measure the link down time detection.
09-23-2011 12:19 AM
Hello,
You have to combine other things like:
ip routing protocol purge interface (global configuration)
interface GigabitEthernet x/y
carrier-delay up msec 500
carrier-delay down msec 0
let me know how that works.
09-23-2011 01:02 AM
Hi,
still one packet loss. I typed carrier-delay on both routers IOS and IOS-XR but "ip routing protocol purge interface" only on IOS because I could not find it on IOS-XR.
I have to say that the router are connected via DWDM and distance is maybe 30km, not sure if this is that important?
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