MPLS-TE Tunnel (FRR) Issue

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Sep 30th, 2013
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Hi


Need some discussion on MPLS - TE tunnel issue.


One of Tunnel with FRR configured, creates problem after a while affects the traffic running on the link until I shut the tunnel manually.


Configs are ok because same configurations made for different cities to authenticate to a AAA server located in one of city.

following is the generic diagram and complete config for respective links in all 3 cities but the tunnel on link highlighted with RED arrow creates problem after a while not at once until I shut the tunnel,


The Platform is Cisco CISCO7609-S and all links are on 7600-SIP-400 module



interface GigabitEthernet2/2/0

description *** Physical Interface ***

dampening

mtu 9216

ip address x.x.x.x x.x.x.x

no ip redirects

no ip proxy-arp

ip ospf message-digest-key 1 md5 7 xxx

ip ospf network point-to-point

load-interval 30

carrier-delay msec 0

negotiation auto

mpls traffic-eng tunnels

mpls traffic-eng backup-path Tunnel2300

mpls ip

service-policy output egress_policy

hold-queue 4096 in

hold-queue 4096 out

ip rsvp bandwidth percent 95

ip rsvp signalling dscp 48

end


x.x.x.x#sh running-config int tun 1300

Building configuration...


Current configuration : 377 bytes

!

interface Tunnel1300

description *** Primary Tunnel ***

ip unnumbered Loopback0

shutdown

mpls ip

tunnel destination x.x.x.x

tunnel mode mpls traffic-eng

tunnel mpls traffic-eng autoroute announce

tunnel mpls traffic-eng path-option 10 explicit name path-1300

tunnel mpls traffic-eng fast-reroute

end



x.x.x.x#sh running-config int tun 2300

Building configuration...


Current configuration : 332 bytes

!

interface Tunnel2300

description *** Backup Tunnel ***

ip unnumbered Loopback0

shutdown

mpls ip

tunnel destination x.x.x.x

tunnel mode mpls traffic-eng

tunnel mpls traffic-eng path-option 10 explicit name path-2300

tunnel mpls traffic-eng record-route

end


MPLS Tunnel FRR.JPG

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Nagendra Kumar ... Mon, 09/30/2013 - 07:23
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  • Cisco Employee,

Hi Qaiser,


Can you explain the problem you are facing?. Is the traffic geting black holed or tunnel goes down/flaps?. Is this tunne single hop or multihopped to destination?.




Regards,

Nagendra

qasey_shiz Mon, 09/30/2013 - 07:30
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Hi Nagendra,


Tunnel status remain up FRR stay ready but traffic become black holed and the tunnel is single hop destination, you can see the attached diagram

qasey_shiz Mon, 10/07/2013 - 07:56
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Hi,


Issue was figured out, the traffic was dropping dut to EF tagged traffic in the service policy applied under the physical interface.


The limit of EF tagged traffic was defined less as per actual traffic which was causing drop in peak hours

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