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34 Intel® Blade Server Ethernet Switch Module IXM5414E: Installation and User’s Guide:A Guide for Technically
GARP Multicast Registration Protocol (GMRP)
Networking devices use the GARP Multicast Registration Protocol to dynamically register (and de-
register) Group membership information with other networking devices attached to the same
segment and across all the bridged LAN devices that support Extended Filtering Services.
The operation of GMRP relies upon the services provided by the GARP. The information registered,
de-registered and disseminated via GMRP is in the following forms:
Group Membership Information
This indicates that there exists one or more GMRP participants which are members of a
particular Group, and carries the group MAC address(es) associated with this Group.
Registration of group membership information allows networking devices to be made aware
that frames destined for these group MAC address(es) should be forwarded in the direction
of registered members of the group. Forwarding of frames destined for the group MAC
address(es) occurs on ports on which such membership registration has been received.
Group Service Requirements Information
This indicates that one or more GMRP participants require Forward all Groups or Forward
Unregistered to be the default filtering behavior. Registration of group services requirement
information allows networking devices to be made aware that any of their ports that can
forward frames in the direction from which the group service requirement information has
been received should modify their default group behavior in accordance with the group
service requirement.
When the switch module receives GMRP PDUs it will update the multicast table with a new entry or
modify an existing entry with the new information. The switch module will forward multicast
packets through only those ports for which GMRP has created a group registration entry (for that
multicast address).
GMRP registrations are specific to a VLAN, which allows the Group filtering behavior for one
VLAN to be independent of the Group filtering behavior for other VLANs. The same ingress rules
are applied to GMRP PDUs as to other packets. Therefore:
• GMRP frames with no VLAN classification (i.e., untagged or priority-tagged GMRP frames)
are discarded if the Acceptable Frame Types parameter for the Port is set to Admit Only VLAN-
tagged frames. Otherwise, they are classified according to the PVID (Port VLAN ID) for the
Port.
• VLAN-tagged GMRP frames are classified according to the VID carried in the tag header.
• If Ingress Filtering is enabled, and if the Port is not in the Member set for the GMRP frame's
VLAN classification, then the frame is discarded.
The VLAN classification thus associated with received GMRP PDUs establishes the VLAN context
for the received PDU, and identifies the GARP participant instance to which the PDU is directed.
GMRP PDUs transmitted by GMRP participants are VLAN-classified according to the VLAN
context associated with that participant. GMRP Participants in VLAN networking devices apply the
same egress rules that are defined for the transmission port. Therefore:
• GMRP PDUs are transmitted through a given port only if the port is a member of the VLAN
concerned.
• GMRP PDUs are transmitted as VLAN-tagged frames or untagged frames, in accordance with
the state of the Untagged Set for that port for the VLAN concerned. Where VLAN-tagged
- User’s Guide 1
- Contents 2
- Contents v 4
- Contents vii 6
- Contents ix 8
- Contents xi 10
- Contents xiii 12
- Contents xv 14
- Contents xvii 16
- CAUTION: 20
- Related publications 25
- Specifications and features 27
- IXM5414E 32
- Installation guidelines 34
- Information panel 42
- Concepts 44
- Port mirroring 48
- Switching concepts 49
- Spanning Tree Protocol (STP) 50
- IEEE 802.1Q VLANs 51
- 802.1Q Packet Forwarding 52
- IEEE 802.1Q VLAN tags 53
- Port VLAN ID 54
- Tagging and untagging 54
- IEEE 802.1Q VLAN configuration 55
- Static MAC filtering 56
- Link aggregation (LAG) 58
- Static LAGs 59
- Distribution method 59
- Local authentication 61
- RADIUS authentication 62
- Secure Shell (SSH) 62
- Quality of Service (QoS) 63
- Access Control Lists (ACL) 64
- Introduction 66
- Getting started 67
- ARP cache 71
- Network connectivity 74
- User accounts 76
- Login configuration 78
- Login session 79
- Login summary 80
- User login 81
- Forwarding database 83
- Message log 85
- Event log 86
- Mirroring 92
- Community configuration 94
- Trap receiver configuration 95
- Trap receiver summary 96
- Switch summary 101
- Port detailed 102
- Port summary 107
- System utilities 109
- Reset passwords to defaults 110
- Download file to switch 111
- Upload file from switch 112
- Trap manager 114
- Trap log 115
- Switching 116
- Configuration 117
- Port configuration 120
- Protocol-based VLAN 122
- MAC filter configuration 125
- MAC filter summary 126
- Switch configuration 128
- IGMP snooping 130
- Interface configuration 131
- MFDB table 134
- GMRP table 135
- IGMP snooping table 136
- Spanning tree 137
- CST port configuration/status 140
- Class of service 142
- Security 143
- Port status 146
- Statistics 150
- Port access privileges 153
- Port access summary 153
- Server configuration 155
- RADIUS statistics 157
- Server statistics 157
- Accounting server statistics 160
- Secure HTTP 161
- Secure Shell 163
- Access Control Lists 164
- Rule configuration 166
- Bandwidth provisioning 169
- Bandwidth profile summary 170
- Traffic class configuration 171
- Traffic class summary 173
- Interface allocation summary 174
- Command name 176
- Parameters 177
- Comments 178
- Special characters 178
- Managing user accounts 180
- Initial configuration 181
- System commands 182
- Inventory information 183
- Port commands 184
- System configuration 190
- System description 194
- TFTP upload example 204
- IGMP snooping commands 210
- MAC filter commands 213
- Protocol-based VLAN commands 216
- Spanning tree commands 217
- Spanning tree port commands 221
- Class of Service commands 227
- Authentication commands 228
- IEEE 802.1X commands 230
- RADIUS accounting commands 235
- RADIUS server commands 238
- Secure Shell (SSH) commands 240
- Appendix B Cable Lengths 252
- Settings 254
- Appendix D CLI Command Tree 260
- Bridging configuration example 268
- VLAN configuration example 269
- Creating a stable topology 275
- IEEE 802.1D STP port states 276
- IEEE 802.1w STP port states 277
- Illustration of STP 279
- Discarding state 281
- Learning state 282
- Forwarding state 283
- Disabled state 285
- Troubleshooting STP 286
- Unidirectional link 287
- Packet corruption 288
- Resource errors 288
- Identifying a data loop 288
- Avoiding network problems 289
- Assistance 292
- Appendix H Notices 294
- General Safety 295
- Electrical Safety 295
- Safety compliance 297
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