User guide

22
To enable timeout and to increase timeout from defaults in the IGMP snooper, the user must put this line
intheCPEcongurationle(examplewithadditional77secondstimeout):
ENABLE_IGMP_TIMEOUT=1 ADDITIONAL_IGMP_TIMEOUT=77 /etc/init.d/igmp restart
#or “enable_igmp_timeout=1 additional_igmp_timeout=77 /etc/init.d/igmp restart”
WhentheCPEdetectsIGMPv2/v3joinpacket,andwillestablishalterforthemulticastgroupforthe
specicportseen,andsetadefaulttime-outvalue(forIGMPv2thespeciedtime-outvalueintheRFC,
forIGMPv3thevalueextractedfromthejoinpacket)forthisspecicmulticastgroup.Theswitchlter
will start to decrease this value immediately.
It is expected that a IGMP Query is present, followed by a IGMP report from the client, saying that it is
still a member of the group
Insomecasesraceconditionscanoccur,iftheCPEltertimesoutbeforeaclienthasrespondedtoan
IGMP query, hence signal will be lost, as CPE expect that the client is no longer member of the multicast
group.
Therefore it is possible to change the default time-out values for the IGMP snooping.
To enable timeout and to increase timeout from defaults in the IGMP snooper, the user must put this line
intheCPEcongurationle(examplewithadditional77secondstimeout):
ENABLE_IGMP_TIMEOUT=1 ADDITIONAL_IGMP_TIMEOUT=77 /etc/init.d/igmp restart
#or “enable_igmp_timeout=1 additional_igmp_timeout=77 /etc/init.d/igmp restart”
ingress rate limitation
TBD
The CPE includes 12 Port Ingress Rate Limitation buckets, that can be assigned to any of the CPE ports,
both WAN and LAN ports.
Bytes to be counted:
• Accountsforallbytes
• Accountsforallbytes,CountallLayer1bytes:
Preamble (8bytes) + Frame’s DA to CRC + IFG (12bytes)
• Accountsforallbytes,CountallLayer2bytes:
Frame’s DA to CRC
• Accountsforallbytes,CountallLayer3bytes:
Frame’s DA to CRC - 18 - 4 (if frame is tagged)
• Broadcast(BC),Multicast(MC)andUnknownmulticastorunicastTrafc(UT).
 Broadcasts,BC#thisshouldbeusedtolimitanybroadcasttrafc
Unknown multicast, UMC # this should be used as you don’t know the destination of any mul
 ticasttrafcknownmulticasts,MC#thisshouldbeusedonlyifyouknowthemulticasttrafc,
must be present in the ATU
Non-Rate Limitation (NRL) overrides can be programmed for VLAN Id’s.
The following example creates two buckets:
Bucket 1 includes LAN port 3 and 4, which totally has an ingress data limitation of 1 Mbps, counted from
layer 3 and upwards. Layer 1 and layer 2 statistics are not included/counted in this bucket.
Bucket 2 includes WAN port, which has an ingress data limitation of 2 Mbps, counted from layer 3 and
upwards. Layer 1 and layer 2 statistics are not included/counted in this bucket.