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Allied Telesis AR400 manual Switch, Page 109 AlliedWare OS How To Note IGMP

Models: AR400

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Page 109

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Appendix: STP state > Switch 2

Switch 2

Manager Switch 2> show stp=default port=25-26

STP Port Information
------------------------------------------------------------------------
STP	default
STP Status	ON
Port	25
RSTP Port Role	Root
State	Forwarding
Point To Point	Yes (Auto)
Port Priority	128
Port Identifier	8019
Pathcost	20000 (auto configured)
Designated Root	32768 : 00-00-cd-01-4b-10
Designated Cost	0
Designated Bridge ...	32768 : 00-00-cd-01-4b-10
Designated Port	8019
EdgePort	No
Counters:
Loopback Disabled	0
Port	26
RSTP Port Role	Designated
State	Forwarding
Point To Point	Yes (Auto)
Port Priority	128
Port Identifier	801a
Pathcost	20000 (auto configured)
Designated Root	32768 : 00-00-cd-01-4b-10
Designated Cost	20000
Designated Bridge ...	32768 : 00-00-cd-02-e5-40
Designated Port	801a
EdgePort	No
Counters:
Loopback Disabled	0
------------------------------------------------------------------------

Page 109 AlliedWare™ OS How To Note: IGMP

Page 109

Image 109

Contents

Introduction ContentsAlliedWare OS Enabling query solicitation on multiple switches in a looped topology Why convergence takes so long without query solicitationQuerier timer values Snooper timer valuesProducts and software versions this note applies to z one AT-8948 switch, with Software Version For most examples in this How To Note, we usedz two Rapier 24i switches, with Software Version IGMP featureQueriers and Snoopers IGMP overviewMessages Choosing group addresses Page 8 AlliedWare OS How To Note IGMP Avoid x.0.0.y, x.0.1.y, x.128.0.y, and x.128.1.yExample IGMP snoopingX Configure switch X Configure switchX Configure switch Page 10 AlliedWare OS How To Note IGMPprocess Explanation of IGMP snoopingigmpsnooping on the Snooper Using Show command output to investigate IGMP statePage 13 AlliedWare OS How To Note IGMP Next, look at the output of the command show ip igmp on the QuerierThis output now shows two entries, one for each of the following Page 14 AlliedWare OS How To Note IGMP When a client leaves a groupPage 15 AlliedWare OS How To Note IGMP Multiple potential IGMP queriersExample X Configure switch X Configure switchX Configure switch Page 16 AlliedWare OS How To Note IGMPExplanation of Multiple potential IGMP queriers When there are no group membersPage 18 AlliedWare OS How To Note IGMP When a client joins a groupRefresh time 228 secs Page 19 AlliedWare OS How To Note IGMPPage 20 AlliedWare OS How To Note IGMP Page 21 AlliedWare OS How To Note IGMP IGMP proxyExample X Configure switch X Configure switchX Configure switch Switch 3 is an IGMP ProxyWhen there are no group members Explanation of IGMP proxyWhen a client joins a group Page 23 AlliedWare OS How To Note IGMPRefresh time 243 secs Page 24 AlliedWare OS How To Note IGMPPage 25 AlliedWare OS How To Note IGMP When a client leaves a groupHow query solicitation works Query solicitation rapid recovery from topology changesTC and sends Initial stateQuery Solicit QS QS and sendsExample Why convergence takes so long without query solicitationX Configure switch X Configure switchExplanation from the perspective of switch 2, the snooper Page 30 AlliedWare OS How To Note IGMP When link comes up againshows this entry Explanation from the perspective of switch 1, the querieragain forwarding the multicast stream out the port Speeding up IGMP convergence in a non-looped topology Enabling query solicitation on multiple switches in a looped topologySwitch 2 sends QS from switchto switch Switch 1 sends GQExample IGMP filtering controlling multicast distributiontypes command X Configure switchX Configure switch X Configure switchPage 37 AlliedWare OS How To Note IGMP Received Explanation of IGMP filtering controlling multicast distributionPassed DroppedPage 39 AlliedWare OS How To Note IGMP Example IGMP throttling limiting the number of streams for each subscriberX Configure switch X Configure switchPage 41 AlliedWare OS How To Note IGMP Page 42 AlliedWare OS How To Note IGMP X Configure switchConsider switch 2 after a client on port 2 has joined six groups from Page 44 AlliedWare OS How To Note IGMP Note that the group list is sorted by refresh time, not group address X Modify switch 2 Configuration When we deny groups instead of replacing themPage 47 AlliedWare OS How To Note IGMP Page 48 AlliedWare OS How To Note IGMP Static IGMPExample X Configure switch X Configure switchz enable IGMP z enable the interface as an IGMP interface Switch 2 is an IGMP SnooperPage 50 AlliedWare OS How To Note IGMP X Configure switchPage 51 AlliedWare OS How To Note IGMP Explanation of Static IGMPX Modify switch 3 Configuration When we add a static entry on another switchPage 53 AlliedWare OS How To Note IGMP Page 54 AlliedWare OS How To Note IGMP X Modify switch 3 Configuration port=5,26 counterPage 55 AlliedWare OS How To Note IGMP MulticastPkts Page 56 AlliedWare OS How To Note IGMP36350 MulticastPktsPage 57 AlliedWare OS How To Note IGMP When a static entry’s port goes downQuerier timer values How clients leave groups queries and timersOverview of leave process Snooper timer values Consequences for high-loss and high-lag networks Comparing the Querier and Snooper timersExample IGMP fast leaveset igmpsnooping fastleave=onoff interface=vlanx set igmpsnooping vlan=vlanx fastleave=onoffX Configure switch X Configure switchX Configure switch Page 62 AlliedWare OS How To Note IGMPPage 63 AlliedWare OS How To Note IGMP Explanation of IGMP fast leavePage 64 AlliedWare OS How To Note IGMP When fast leave is disabledIt is safe to ignore the group entry on switch When you enable fast leave on switchSimilarly, we can easily disable Fast Leave on all interfaces When you set fast leave on all interfacesMultiple host mode for fast leave Page 68 AlliedWare OS How To Note IGMP Timer and counter relationships Configurable IGMP timers and countersz Timer and counter relationships on page z Software versions on page z Initial configuration on page z Default values on pageSoftware versions Initial configurationX Configure switch X Configure switchX Configure switch Configurable IGMP timers and counters Initial configurationLast Member Query Count and Last Member Query Interval Default valuesWhat these counters do How to change these counters Potential problems with changing these countersLast Member Query Interval 1/10secsLast Member Query Count Page 74 AlliedWare OS How To Note IGMPHow to change this counter Potential problems with changing this counterRobustness Variable What this counter doesWhat this timer does Default Query IntervalPotential problems with changing this timer How to change this timerWhat this timer does Query Response IntervalPotential problems with changing this timer How to change this timerSynchronisation of timers Default Timeout IntervalWhat this timer does Potential problems with changing this timerDefaults First, the following output shows the default settings Increase Default Query IntervalThe Default Timeout Interval = 2*125 + 100/10 = 260 seconds Next, change the Default Query Interval to 130 secondsPage 80 AlliedWare OS How To Note IGMP Increase Query Response IntervalPage 81 AlliedWare OS How To Note IGMP Override Default Timeout IntervalDefault Timeout Interval = 2 * 200 + 10 = 410 seconds Default Timeout Interval =Page 82 AlliedWare OS How To Note IGMP Timer Example of bad choices for timer valuesDefault Timeout Interval set ip igmp timeout=126Problem 2 Query Response Interval short Problem 1 Last Member Query Interval too shortProblem 3 Default Timeout Interval too short not recommend this For more information, see Synchronisation of timers on pageExample Stopping snoopers from snooping non-IGMP messagesOSPF X Configure switch X Configure switchX Configure switch Page 87 AlliedWare OS How To Note IGMPX Configure the router Ports 25 Page 89 AlliedWare OS How To Note IGMPPorts Disabling All Groups entry for a port Preventing an All Groups entry for a port3. Reset port 24’s packet counters 2. Check the group entry timeout valuesEnabling All Groups entry again 1. Permit port 24 to be an All Groups port againPage 92 AlliedWare OS How To Note IGMP 5. Check the group entry timeout values again8. Check the group entry timeout values again 6. Enable IGMP debuggingPage 93 AlliedWare OS How To Note IGMP Page 94 AlliedWare OS How To Note IGMP z the ports internal timer hits zero and is refreshedz the streams group entry times out and is refreshed, or It is most likely that the group entry will time out firstThis option Controlling which addresses create All Groups entriespackets from set igmpsnooping routermode=ip Configuring switchdelete igmpsnooping routeraddress=224.0.0.5 Page 97 AlliedWare OS How To Note IGMP Adding other router addresses Configuring switches 1 andPage 98 AlliedWare OS How To Note IGMP To return to the default list, change the router mode to default Returning to the default listPage 100 AlliedWare OS How To Note IGMP Using the other routermode options2. Check the current IGMP snooping entries Statically specifying that a port is a router portExample 4. Stop port 6 from being a static router port 3. Statically add port 6 as a router port attached to VLANTo remove the static configuration, simply delete it X A client joins a group IGMP debuggingExample X A client leaves a group X Snooped ports change X A port entry times outPage 105 AlliedWare OS How To Note IGMP X A port in the All Groups list is unplugged X A report is filtered outPage 106 AlliedWare OS How To Note IGMP Page 107 AlliedWare OS How To Note IGMP X Output for show ip igmp changesAppendix STP state SwitchPage 109 AlliedWare OS How To Note IGMP SwitchUSA Headquarters 19800 North Creek Parkway Suite 100 Bothell WA 98011 USA T +1 800 424 4284 F +1 425 481 Switch