Allied Telesis AR400 manual Client leaves a group, Several minutes later the group entry times out

Page 104

IGMP debugging > Example

XA client leaves a group

Client 2 sends a Leave message for group 224.12.13.14. Switch 1 sees the Leave message on vlan100 (port 49). The port is in a state of “deferred deletion” because of the Last Member Query process (see "Last Member Query Count and Last Member Query Interval" on page 72).

Switch 1 is an IGMP Querier, so it sends out two Membership Queries and waits 2 seconds for a response. None arrives, so switch 1 deletes the entry.

Manager Switch 1> IGMP Snoop(48) on vlan100: Leave -> IGMP Snoop(48): Leave g. group 224.12.13.14 - Port 49 in deferred deletion.

IGMP Rx(48) on vlan100: Leave -> IGMP Rx(48): Leave group=224.12.13.14 -> group .

Several minutes later the group entry times out.

Manager Switch 1> IGMP Snoop Timeout: group=224.12.13.14 (0) is deleted Deleting all ports for group 224.12.13.14 on vlan100

IGMP Timeout: group=224.12.13.14 (0) is deleted

Meanwhile, switch 3, which has the client attached to it, sees the same sequence but debugs it differently. Like switch 1, switch 3 logs the Leave message, but its output also includes the port on which it received the Leave message. This enables you to identify the client. Switch 3 also logs the two Specific Queries and notes the 2 second timeout. After 2 seconds it also deletes the entry from its IGMP snooping table.

Manager Switch 3> IGMP Snoop: resending pkt to vlan utPorts: 1-4,6-26 fwdPorts: 26

IGMP Snoop(2) on vlan100: Leave -> IGMP Snoop(2): Leave group=224.12.13.14-> gr. group 224.12.13.14 - Port 3 in deferred deletion.

IGMP MVR Snoop: discard - no MVR snooper for code 23

IGMP Snoop: resending pkt to vlan utPorts: 1-4,6-26 fwdPorts: 3,26

IGMP Snoop(25) on vlan100: Query -> code 10

igmpSnoopMembershipQuery >> setting timer at 2 secs for group 224.12.13.14

snooped group 224.0.0.2 added

Adding port 26 for group 224.0.0.2 on vlan100

IGMP MVR Snoop: discard - no MVR snooper for code 17

Manager Switch 3> IGMP Snoop: resending pkt to vlan utPorts: 1-4,6-26 fwdPorts: 3,26

IGMP Snoop(25) on vlan100: Query -> code 10

igmpSnoopMembershipQuery >> setting timer at 2 secs for group 224.12.13.14

snooped group 224.0.0.2 added

Adding port 26 for group 224.0.0.2 on vlan100

IGMP MVR Snoop: discard - no MVR snooper for code 17

Manager Switch 3> IGMP Snoop Timeout: group=224.12.13.14 (0) is deleted Deleting all ports for group 224.12.13.14 on vlan100

Page 104 AlliedWare™ OS How To Note: IGMP

Page 103 Page 105
Image 104
Page 103 Page 105
Contents Contents IntroductionQuery solicitation rapid recovery from topology changes How clients leave groups queries and timersConfigurable Igmp timers and counters Example of bad choices for timer valuesProducts and software versions this note applies to Igmp feature Software versions Products 4 AlliedWare OS How To Note IgmpQueriers and Snoopers 5 AlliedWare OS How To Note IgmpIgmp overview 6 AlliedWare OS How To Note Igmp Messages7 AlliedWare OS How To Note Igmp Choosing group addressesIP address, binary MAC address, hex8 AlliedWare OS How To Note Igmp Avoid x.0.0.y, x.0.1.y, x.128.0.y, and x.128.1.yExample 9 AlliedWare OS How To Note IgmpIgmp snooping Configure switch 10 AlliedWare OS How To Note Igmp11 AlliedWare OS How To Note Igmp Explanation of Igmp snoopingUsing Show command output to investigate Igmp state Group List Entry timeout 136 secs Ports NoneGroup List Entry timeout 257 Secs Ports All Groups 235 12 AlliedWare OS How To Note Igmp13 AlliedWare OS How To Note Igmp Group Last Adv14 AlliedWare OS How To Note Igmp When a client leaves a groupGroup List Entry timeout 247 secs Ports 15 AlliedWare OS How To Note Igmp Multiple potential Igmp queriers16 AlliedWare OS How To Note Igmp 17 AlliedWare OS How To Note Igmp When there are no group membersOther Querier timeout .. secs When a client joins a group Group List Entry timeout 225 secs PortsAll Groups Entry timeout Secs Ports 18 AlliedWare OS How To Note IgmpGroup List Last Adv 19 AlliedWare OS How To Note IgmpGroup List 20 AlliedWare OS How To Note Igmp 21 AlliedWare OS How To Note Igmp Igmp proxySwitch 3 is an Igmp Proxy 22 AlliedWare OS How To Note IgmpGroup List Entry timeout 122 secs Ports None All Groups Entry timeout 145 Secs Ports23 AlliedWare OS How To Note Igmp Explanation of Igmp proxyGroup Entry timeout Secs Ports 24 AlliedWare OS How To Note IgmpGroup Entry timeout 182 secs Ports 25 AlliedWare OS How To Note IgmpHow query solicitation works Query solicitation rapid recovery from topology changes26 AlliedWare OS How To Note Igmp 27 AlliedWare OS How To Note Igmp Initial stateExample Why convergence takes so long without query solicitation28 AlliedWare OS How To Note Igmp Explanation from the perspective of switch 2, the snooper 29 AlliedWare OS How To Note IgmpAll Groups Entry timeout 236 secs Ports 30 AlliedWare OS How To Note IgmpExplanation from the perspective of switch 1, the querier Group Entry timeout 18 secs Ports31 AlliedWare OS How To Note Igmp Shows this entryGroup Entry timeout 115 secs Ports 32 AlliedWare OS How To Note Igmp33 AlliedWare OS How To Note Igmp Speeding up Igmp convergence in a non-looped topology34 AlliedWare OS How To Note Igmp Switch 1 sends GQ35 AlliedWare OS How To Note Igmp Igmp filtering controlling multicast distribution36 AlliedWare OS How To Note Igmp Types commandSet switch port=1 igmpfilter=1 Switch 3 is also an Igmp Snooper 37 AlliedWare OS How To Note Igmp38 AlliedWare OS How To Note Igmp Received Passed Dropped39 AlliedWare OS How To Note Igmp No group memberships40 AlliedWare OS How To Note Igmp 41 AlliedWare OS How To Note Igmp 42 AlliedWare OS How To Note Igmp 43 AlliedWare OS How To Note Igmp 44 AlliedWare OS How To Note Igmp 45 AlliedWare OS How To Note Igmp 46 AlliedWare OS How To Note Igmp When we deny groups instead of replacing themModify switch 2 Configuration Group 224.12.13.11 Entry timeout 255 secs Ports 224.12.13.12 47 AlliedWare OS How To Note Igmp48 AlliedWare OS How To Note Igmp Static IgmpSwitch 2 is an Igmp Snooper 49 AlliedWare OS How To Note Igmp50 AlliedWare OS How To Note Igmp Explanation of Static Igmp Group Entry timeout Infinity Ports51 AlliedWare OS How To Note Igmp When we add a static entry on another switch Modify switch 3 Configuration52 AlliedWare OS How To Note Igmp MulticastPkts 675826All Groups Entry timeout 247 secs Ports 53 AlliedWare OS How To Note Igmp54 AlliedWare OS How To Note Igmp Group Entry timeout Infinity Ports 5,26 55 AlliedWare OS How To Note IgmpMulticastPkts 14756 56 AlliedWare OS How To Note IgmpMulticastPkts 36350 57 AlliedWare OS How To Note Igmp When a static entry’s port goes downGroup Entry timeout Infinity Ports None How clients leave groups queries and timers Querier timer values58 AlliedWare OS How To Note Igmp Overview of leave processSnooper timer values 59 AlliedWare OS How To Note IgmpComparing the Querier and Snooper timers 60 AlliedWare OS How To Note IgmpConsequences for high-loss and high-lag networks Describes the new behaviour61 AlliedWare OS How To Note Igmp Igmp fast leaveSwitch 1 is an Igmp Querier 62 AlliedWare OS How To Note Igmp63 AlliedWare OS How To Note Igmp Explanation of Igmp fast leaveWhen fast leave is disabled Group Entry timeout 2 secs Ports64 AlliedWare OS How To Note Igmp Fast Leave OffWhen you enable fast leave on switch It is safe to ignore the group entry on switchGroup Entry timeout Secs Ports None 65 AlliedWare OS How To Note IgmpWhen you set fast leave on all interfaces 66 AlliedWare OS How To Note IgmpMultiple host mode for fast leave To specify multiple mode, use the commandTo specify single mode, use either of the commands 67 AlliedWare OS How To Note Igmp68 AlliedWare OS How To Note Igmp 69 AlliedWare OS How To Note Igmp Configurable Igmp timers and countersTimer and counter relationships Initial configuration Each example modifies the following base configuration70 AlliedWare OS How To Note Igmp Software versions71 AlliedWare OS How To Note Igmp Default values 72 AlliedWare OS How To Note IgmpLast Member Query Count and Last Member Query Interval What these counters doPotential problems with changing these counters How to change these counters73 AlliedWare OS How To Note Igmp Last Member Query Interval 255 10secs74 AlliedWare OS How To Note Igmp Last Member Query CountPotential problems with changing this counter How to change this counterRobustness Variable What this counter doesDefault Query Interval What this timer doesPotential problems with changing this timer How to change this timerQuery Response Interval 100 10secs 77 AlliedWare OS How To Note IgmpQuery Response Interval 78 AlliedWare OS How To Note Igmp Default Timeout IntervalSynchronisation of timers Default Timeout Interval = 2*130 + 100/10 = 270 seconds 79 AlliedWare OS How To Note IgmpDefault Timeout Interval = 2*125 + 100/10 = 260 seconds Default Timeout Interval 280 Secs80 AlliedWare OS How To Note Igmp Query Response Interval 200 10secsDefault Timeout Interval 180 Secs 81 AlliedWare OS How To Note IgmpDefault Query Interval 200 Secs Default Timeout Interval 410 82 AlliedWare OS How To Note IgmpExample of bad choices for timer values Imagine the following changes to the configurationCommands to configure these settings are 83 AlliedWare OS How To Note IgmpProblem 1 Last Member Query Interval too short Problem 2 Query Response Interval shortProblem 3 Default Timeout Interval too short Last Member Query Interval was set to 5, using the commandFor more information, see Synchronisation of timers on 85 AlliedWare OS How To Note Igmp86 AlliedWare OS How To Note Igmp Stopping snoopers from snooping non-IGMP messages87 AlliedWare OS How To Note Igmp Configure the router 88 AlliedWare OS How To Note IgmpRouter uses Ospf Ports 2489 AlliedWare OS How To Note Igmp Ports 25Disabled All-groups Ports 90 AlliedWare OS How To Note IgmpPreventing an All Groups entry for a port Disabling All Groups entry for a portCheck the group entry timeout values Reset port 24’s packet countersEntry timeout 216 Secs Enabling All Groups entry againCheck the group entry timeout values again Entry timeout Secs92 AlliedWare OS How To Note Igmp MulticastPkts93 AlliedWare OS How To Note Igmp Enable Igmp debuggingEntry timeout 259 Secs 94 AlliedWare OS How To Note Igmp MulticastPkts 91495 AlliedWare OS How To Note Igmp Controlling which addresses create All Groups entries224.0.0.5 Configuring switch96 AlliedWare OS How To Note Igmp 97 AlliedWare OS How To Note Igmp Adding other router addresses Configuring switches 198 AlliedWare OS How To Note Igmp 224.0.0.254 Returning to the default list99 AlliedWare OS How To Note Igmp Using the other routermode options 100 AlliedWare OS How To Note IgmpCheck the current Igmp snooping entries 101 AlliedWare OS How To Note IgmpStatically specifying that a port is a router port To remove the static configuration, simply delete it 102 AlliedWare OS How To Note IgmpStatically add port 6 as a router port attached to Vlan Stop port 6 from being a static router portClient joins a group 103 AlliedWare OS How To Note IgmpIgmp debugging IgmpSnoopMembershipQuery setting timer at 2 secs for group 104 AlliedWare OS How To Note IgmpClient leaves a group Several minutes later the group entry times outManager Switch 3 del vlan=100 port=5 105 AlliedWare OS How To Note IgmpPort entry times out Snooped ports changePort in the All Groups list is unplugged 106 AlliedWare OS How To Note IgmpReport is filtered out 107 AlliedWare OS How To Note Igmp Output for show ip igmp changesSwitch 108 AlliedWare OS How To Note IgmpAppendix STP state State Forwarding109 AlliedWare OS How To Note Igmp Manager Switch 3 show stp port=25-26
Top Page Image Contents