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Software Version 2.7.5 29
Software Version 2.7.5
C613-10454-00 REV A
Filtering and Throttling
IGMP filtering and throttling let you control the distribution of multicast
services on each switch port. IGMP filtering controls which multicast groups a
host on a switch port can join. IGMP throttling limits the number of multicast
groups that a host on a switch port can join.
IGMP filtering and throttling are applied to multicast streams forwarded by
IGMP, IGMP Snooping, or MVR.
IGMP filtering and throttling can be applied separately, or together, on the
same switch port. Filtering is applied first, and any multicast group
memberships passed by the filter are further subjected to the limits imposed by
throttling.
IGMP Filters
An IGMP filter controls the multicast groups that a port can be a member of by
filtering IGMP Membership Reports from hosts attached to the port.
Static associations of switch ports and multicast groups are not affected by
IGMP filtering.
Format of a filter An IGMP filter consists of zero or more entries. An entry consists of:
■ A multicast address range to match against. Address ranges in multiple
entries can overlap.
■ An action to take (include or exclude) when a Membership Report matches
the multicast address range.
Each filter has an implicit exclude entry as the last entry in the filter.
Matching against a
filter
When an IGMP filter is applied to a switch port:
1. IGMP matches Membership Reports from the switch port against each
entry in the filter applied to the port.
2. If the group address in the Membership Report matches the multicast
address range of a filter entry, IGMP takes the action specified by the filter
entry:
•If the action is include, IGMP processes the Membership Report as
normal. The port is able to join the multicast group.
•If the action is exclude, IGMP excludes the Membership Report from
normal IGMP processing and discards the packet. The port is not able
to join the multicast group.
Filter processing stops when a match is found.
3. If the group address in the Membership Report does not match any entry in
the filter, IGMP excludes the Membership Report from normal IGMP
processing and discards the packet. The port is not able to join the multicast
group.
Applying an empty IGMP filter (a filter with no entries) to a switch port blocks
all Membership Reports because of the filter’s implicit exclude entry.
- Software Version 2.7.5 1
- Overview of New Features 4
- MSS Clamping 5
- 8 MSS Clamping Release Note 8
- Software Version 2.7.5 9 9
- 10 MSS Clamping Release Note 10
- Syntax SHow PPP PPPoe 11
- Command changes 13
- Command Reference Updates 14
- Software Version 2.7.5 15 15
- Command Changes 18
- Syntax SHow IP 21
- DHCP Option 82 Relay 22
- Software Version 2.7.5 25 25
- Syntax SHow BOOTp RELAy 26
- IGMP Enhancements 28
- Filtering and Throttling 29
- Configuring IGMP 30
- IGMP Throttling 31
- Software Version 2.7.5 33 33
- Software Version 2.7.5 35 35
- OSPF Network Types 41
- [{FULl 45
- BGP Enhancements 46
- Automatic Summarising 48
- Aggregating Routes 50
- Software Version 2.7.5 53 53
- Syntax SHow BGP 55
- Syntax SHow BGP PEer[=ipadd] 56
- Software Version 2.7.5 59 59
- Software Version 2.7.5 61 61
- Firewall Enhancements 63
- UDP Port Timeout 65
- Software Version 2.7.5 67 67
- Software Version 2.7.5 73 73
- WAN Load Balancing 74
- VRRP Preemption Delay 75
- Software Version 2.7.5 77 77
- ..3600] [PRIOrity=1..254] 77
- Operating Principles 80
- Load Distribution Methods 81
- 1-4 Release Note 82
- WAN Load Balancing 1-5 83
- Healthcheck 84
- Assigning Weights 85
- Healthchecks 86
- Operation with Firewall 87
- 1-10 Release Note 88
- Before you 89
- Parameter Description 96
- ● eth (such as eth0, eth1) 100
- ● PPP (such as ppp0, ppp1) 100
- C613-10454-00 REV A 101
- Related Commands enable wanlb 109
- Syntax SHow WANLB 112
- Syntax SHow WANLB HEALthcheck 114
- ■ eth (such as eth0, eth1) 122
- ■ PPP (such as ppp0, ppp1) 122
- Filtering IP Routes 123
- 2-2 Release Note 124
- Introduction 125
- Types of Filters 126
- About AS Path Lists 127
- About Route Maps 127
- When to use 128
- About IP Route Filters 129
- Creating Filters 130
- Creating Route Maps for BGP 131
- How to create a route map 132
- ■ exclude the update message 133
- Example comparing 134
- AS path filter and 134
- Matching on 134
- Creating Route Maps for OSPF 138
- Creating IP Route Filters 141
- Applying Filters 142
- Applying AS path 143
- ■ prefix lists 148
- ■ AS path lists 148
- ■ route maps 148
- 2-28 Release Note 150
- [other-options] 150
- Filtering IP Routes 2-29 151
- The filtering 151
- Limitations of route 153
- Interface Routes 154
- Statically-Configured Routes 155
- Configuration Examples 156
- Using a Route Map 157
- Using an AS Path Filter 158
- Using Communities 160
- Command Reference 162
- Parameters for both 173
- Parameters for 173
- Parameters for set 176
- ■ an entire route map 181
- [PREfix=ipadd] 182
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