Enterasys b5

Configuring Policy Class of Service (CoS)
11-18 Policy Classification Configuration
2.0 97 irl none
2.0 98 irl none
2.0 99 irl none
4. IntheCoS settingstable,configureaCoSsettingforCoSindex1,whichhasapriorityof0.We
entertheIRLreference,createdinthepreviousstep.
B5(su)->set cos settings 0 irl-reference 1
B5(su)->show cos settings
CoS Index Priority ToS IRL
--------- ---------- ------- -----
0 0 * 1
1 1 * *
2 2 * *
3 3 * *
4 4 * *
5 5 * *
6 6 * *
7 7 * *
About CoS-Based Flood Control
CoS‐basedfloodcontrolpreventsconfiguredportsfrombeingdisruptedbyatraffic stormbyrate‐
limitingspecifictypesofpacketsthroughthoseports.Whenfloodcontrolisenabledonaport,
incomingtrafficismonitoredoveronesecondintervals.Duringaninterval,theincomingtraffic
rateforeachconfiguredtraffic
type(unica st,broadcast,multicast)iscomparedwiththe 
configuredtrafficfloodcontrolrate,specifiedinpacketspersecond.
If,duringaonesecondinterval,theincomingtrafficofaconfiguredtypereachesthetrafficflood
controlrateconfiguredontheport,CoS‐basedfloodcontroldropsthetrafficuntiltheinterval

ends.Packetsarethenallowedtoflowagainuntilthelimitisagainreached.
ThefollowingproceduredescribesthestepsandcommandsrequiredtoconfigureCoS‐based
floodcontrol.
Example
Thisexamplecreatesabroadcastratelimiter(index1.0)of5packetspersecondandassignsitto
portsge.1.2andge.2.2.
B5(su)->set cos state enable
B5(su)->set cos port-resource flood-ctrl 1.0 broadcast rate 5
B5(su)->set cos port-config flood-ctrl 1.0 ports ge.1.2;ge.2.2 append
Procedure 11-2
Step Task Command(s)
1. Enable CoS. set cos state enable
2. Create a CoS flood control port resource, which
specifies flood control rate limiters that can be
mapped to specific ports.
set cos port-resource flood-ctrl
3. Assign the flood control resource to specific
ports.
set cos port-config flood-ctrl