07-02-2009 03:10 AM - edited 03-04-2019 05:17 AM
I have 10 Mbps link from service provider ,( BGP is running by ISP).We have eigrp between location but as bandwidth utilization goes beyond 10 Mb eigrp session expired.i tried QOS for eigrp with reserve bandwidth of 1 Mb but it is not working.We have eigrp over tunnel.
07-02-2009 05:58 AM
Your approach on using QoS was a sound one but you aren't going to match any EIGRP traffic via the physical interface. As you mentioned the EIGRP is active on the GRE tunnel, not the physical interface so that interface will just see the GRE payload.
You may need to use QoS pre-classify on the tunnel and mark traffic on that tunnel with a DSCP value.
At the physical interface, you can apply an outbound service-policy to match on that DSCP and reserve the necessary bandwidth.
HTH,
__
Edison.
07-02-2009 06:23 AM
Hi Edison,
Thanks for suggest , kindly find the below config on router.
Tunnel for eigrp
interface Tunnel1
description **Tunnel 10Mbps **
bandwidth 10000
ip address a.b.c.d
ip tcp adjust-mss 1380
load-interval 30
delay 10
qos pre-classify
keepalive 10 3
tunnel source x.x.x.x
tunnel destination Y.Y.Y.Y
end
Physical interface on which policy is applied
interface FastEthernet2/0
description ** -10Mbps **
ip address x.x.x.x
no ip redirects
no ip unreachables
ip flow ingress
ip flow egress
no ip mroute-cache
load-interval 30
service-policy output VOICE-EF-SIG
QOS
Extended IP access list EIGRP-QOS
10 permit eigrp any host 224.0.0.10 (7893 matches)
20 permit eigrp any host Tunnel source IP
30 permit eigrp any host tUNNEL DESTINATION IP (3934 matches)
40 permit eigrp any any dscp cs6 (3720 matches)
class-map match-all EIGRP-QOS
match access-group name EIGRP-QOS
Class EIGRP-QOS
Bandwidth 1024 (kbps) Max Threshold 64 (packets)
Policy Map VOICE-EF-SIG
Class VOICE_EF
Strict Priority
Bandwidth 2048 (kbps) Burst 51200 (Bytes)
Class VOICE_SIG
Bandwidth 50 (kbps) Max Threshold 64 (packets)
Class QOS-VC-CLASS
Bandwidth 2048 (kbps) Max Threshold 64 (packets)
Class Class-HPOV
Bandwidth 2048 (kbps) Max Threshold 64 (packets)
Class EIGRP-QOS
Bandwidth 1024 (kbps) Max Threshold 64 (packets)
Is there anything to do further for avoiding eigrp neighbor disconnection due to bandiwidth issue over BGP ?
07-02-2009 07:06 AM
Did you apply those changes now or were they implemented before?
Looks good.
Another issue you may be running is if your router is overloaded due to the high traffic and it's dropping packets. Check your CPU and make sure it is not hitting 100% for a long period of time.
Also, check the class EIGRP-QOS for packet drops within that class as well as interface level output drops.
Additionally, your ISP may be enforcing a policer once you hit 10Mbps and it may be dropping all traffic. You may want to shape outbound to a value less than 10Mbps to avoid drops.
HTH,
__
Edison.
07-02-2009 08:11 PM
Thanks for your valuable suggestion.
1)changes done before( Starting discussion)
2)This is 7200 se router , dont have issue of CPU utilization
3)No drops found in class map
Class-map: EIGRP-QOS (match-all)
17402 packets, 3651310 bytes
30 second offered rate 0 bps, drop rate 0 bps
Match: access-group name EIGRP-QOS
Queueing
Output Queue: Conversation 268
Bandwidth 1024 (kbps)Max Threshold 64 (packets)
(pkts matched/bytes matched) 3934/2331446
(depth/total drops/no-buffer drops) 0/0/0
4)Service provider policing traffic , more than 10 Mbps we are getting drop that is root cause of breaking eigrp seesion.
BGP is not serious about eigrp ( hello,update) packet.
07-03-2009 08:11 AM
To reiterate, configure a hierarchical QoS with a parent shaper of 9.5Mbps or 9Mbps to prevent the Service Provider's policer.
__
Edison.
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