I am having some trouble with my WAN link. We have replication data traversing the WAN from our head office to our DR site constantly. With this traffic marked I can see that even though the bandwidth percent is at 30%, it continually rises to up around 85-90% of the link.
I understand that this is how the command should work, however it seems that it is causing issues becasue other traffic that is prioritised higher is not getting through fast enough even though it is a small amount of traffic.
What I want is for the SAN_REPLICATION data class map to stay at a certain mbps value and not exceed it. I understand that the commands do only use the rest of the traffic when there is nothing competing but for some reason having this use so much bandwidth is severely impacting the TCC_DIRECT and BSADB1 traffic, which are both time sensitive apps.
class-map match-all TCC_DIRECT
match dscp af32
class-map match-all SAN_REPLICATION
match dscp cs1
class-map match-all VIDEO_QoS
match dscp cs5
class-map match-all BSADB1
match dscp cs3
bandwidth percent 30
priority percent 10
bandwidth percent 7
bandwidth percent 7
shape average 20000000
You can see in the below command how much of the 20mbps it uses
sh policy-map interface fa0/1
Service-policy output: SHAPE_TRAFFIC_20Mbps
Class-map: class-default (match-any)
3519814138 packets, 3485395070405 bytes
30 second offered rate 20166000 bps, drop rate 238000 bps
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You might embed a policer in the SAN_REPLICATION class, but I would first suggest setting your shaper's Tc to about 10ms, if larger, and reducing the SAN_REPLICATION class bandwidth reservation. (Normally everyone thinks of class bandwidth as bandwidth allowances, but it also impacts scheduler class packet selection too. If the other classes will leave sufficient bandwidth, you might even try just 1% for SAN_REPLICATION.)
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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