Allied Telesis EPSR AT-8948 User Manual

C613-16092-00 REV Dwww.alliedtelesis.comAlliedWareTM OSHow To |IntroductionPutting a ring of Ethernet switches at the core of a network is a simple wa

Page 10 | AlliedWare™ OS How To Note: EPSRHow To Configure EPSRModifying the Control VLANYou cannot modify the control VLAN while EPSR is enabled. If

Page 11 | AlliedWare™ OS How To Note: EPSRExample 1: A Basic RingExample 1: A Basic RingThis example builds a simple 3-switch ring with one data VLAN,

Page 12 | AlliedWare™ OS How To Note: EPSRExample 1: A Basic Ringdelete vlan=1 port=1-2This step creates the domain, specifying that this switch is th

Page 13 | AlliedWare™ OS How To Note: EPSRExample 1: A Basic RingThis step creates the domain, specifying that this switch is the transit node. It als

Page 14 | AlliedWare™ OS How To Note: EPSRExample 2: A Double RingExample 2: A Double RingThis example adds to the previous ring by making two domains

Page 15 | AlliedWare™ OS How To Note: EPSRExample 2: A Double RingThis transit node is the same as in the previous example (except that the domain has

Page 16 | AlliedWare™ OS How To Note: EPSRExample 2: A Double RingConfigure EPSR:create epsr=domain2 mode=transit controlvlan=vlan40add epsr=domain2 d

Page 17 | AlliedWare™ OS How To Note: EPSRExample 3: EPSR and RSTPExample 3: EPSR and RSTPThis example uses EPSR to protect one ring and RSTP to prote

Page 18 | AlliedWare™ OS How To Note: EPSRExample 3: EPSR and RSTPThis transit node (B) is the same as in the previous example.create vlan=vlan1000 vi

Page 19 | AlliedWare™ OS How To Note: EPSRExample 3: EPSR and RSTPConfigure the control VLAN for EPSR:create vlan=vlan1000 vid=1000add vlan=1000 port=

Page 2 | AlliedWare™ OS How To Note: EPSRWhich products and software versions does it apply to?• "Example 3: EPSR and RSTP" on page 17 • &qu

Page 20 | AlliedWare™ OS How To Note: EPSRExample 4: EPSR with Nested VLANsExample 4: EPSR with Nested VLANsIn this example:• client switches A and C

Page 21 | AlliedWare™ OS How To Note: EPSRExample 4: EPSR with Nested VLANs Configure the EPSR control VLAN:create vlan=vlan100 vid=100add vlan=100 po

Page 22 | AlliedWare™ OS How To Note: EPSRExample 4: EPSR with Nested VLANs create vlan=vlan20 vid=20add vlan=20 port=20 frame=taggedenable ipadd ip i

Page 23 | AlliedWare™ OS How To Note: EPSRExample 5: EPSR with management stackingExample 5: EPSR with management stackingIn this example:• three swit

Page 24 | AlliedWare™ OS How To Note: EPSRExample 5: EPSR with management stacking The following commands must be entered into the CLI of this particu

Page 25 | AlliedWare™ OS How To Note: EPSRExample 5: EPSR with management stacking The stack now exists, so you can configure all three switches from

Page 26 | AlliedWare™ OS How To Note: EPSRExample 6: EPSR with an iMAPExample 6: EPSR with an iMAPThis example is the same as "Example 1: A Basic

Page 27 | AlliedWare™ OS How To Note: EPSRExample 6: EPSR with an iMAPChecking the Master Node ConfigurationTo see a summary, use the command:show eps

Page 28 | AlliedWare™ OS How To Note: EPSRExample 6: EPSR with an iMAPConfigure the AT-TN7100 iMAP as a Transit NodeThe following diagram shows a part

Page 29 | AlliedWare™ OS How To Note: EPSRClassifiers and Hardware FiltersTo see details, use the command:show epsr=testThe following diagram shows th

Page 3 | AlliedWare™ OS How To Note: EPSRHow EPSR WorksHow EPSR WorksEPSR operates on physical rings of switches (note, not on meshed networks). When

Page 30 | AlliedWare™ OS How To Note: EPSRPorts and Recovery TimesPorts and Recovery TimesIn practice, recovery time in an EPSR ring is generally betw

Page 31 | AlliedWare™ OS How To Note: EPSRIGMP Snooping and Recovery TimesIGMP Snooping and Recovery TimesSince Software Version 281-03, IGMP snooping

Page 32 | AlliedWare™ OS How To Note: EPSREPSR State and SettingsEPSR State and SettingsTo display the EPSR state, the attached VLANs, the ring ports,

Page 33 | AlliedWare™ OS How To Note: EPSREPSR State and SettingsMaster Nodein a Failed RingIn contrast, the following diagram shows the output for a

Page 34 | AlliedWare™ OS How To Note: EPSRSNMP TrapsSNMP TrapsYou can use SNMP traps to notify you when events occur in the EPSR ring.Download the lat

Page 35 | AlliedWare™ OS How To Note: EPSRCountersCountersThe EPSR counters record the number of EPSR messages that the CPU received and transmitted.

Page 36 | AlliedWare™ OS How To Note: EPSRDebuggingDebuggingThis section walks you through the EPSR debugging output as links go down and come back up

Page 37 | AlliedWare™ OS How To Note: EPSRDebugging The master node continues sending Health messages, and increments the Hello Sequence number with e

Page 38 | AlliedWare™ OS How To Note: EPSRDebugging The master node receives a Link-Down message on its secondary port (port 2) from transit node B, w

Page 39 | AlliedWare™ OS How To Note: EPSRDebugging The Hello timer expires, which would normally trigger the master node to send a Health message out

Page 4 | AlliedWare™ OS How To Note: EPSRHow EPSR WorksEstablishing a RingOnce you have configured EPSR on the switches, the following steps complete

Page 40 | AlliedWare™ OS How To Note: EPSRDebugging The master node receives the Health message on its secondary port (port 2). This tells it that all

Page 41 | AlliedWare™ OS How To Note: EPSRDebugging The master node continues transmitting and receiving Health messages for as long as the ring stays

Page 42 | AlliedWare™ OS How To Note: EPSRDebuggingTransit Node (Node B) Debug OutputThe following debugging shows the same events as the previous sec

Page 43 | AlliedWare™ OS How To Note: EPSRDebugging The transit node detects that port 1 (between the transit node and the master node) has gone down.

Page 44 | AlliedWare™ OS How To Note: EPSRDebugging The transit node detects that port 1 has come back up. It sends a trap and changes the EPSR state

Page 45 | AlliedWare™ OS How To Note: EPSRDebugging The Health message from the previous step reaches the master node and shows it that all links in t

Page 46 | AlliedWare™ OS How To Note: EPSRDebugging The transit node continues receiving Health messages for as long as the ring stays in a state of C

Page 47 | AlliedWare™ OS How To Note: EPSRDebuggingLink Down Between Two Transit NodesThis section shows the debugging output when the link between tr

Page 48 | AlliedWare™ OS How To Note: EPSRDebugging When the link goes down, the master node transmits a Health message but does not receive it on its

Page 49 | AlliedWare™ OS How To Note: EPSRDebugging In response to the Link-Down message, the master node transmits a Ring-Down-Flush-FDB message out

Page 5 | AlliedWare™ OS How To Note: EPSRHow EPSR WorksDetecting a FaultEPSR uses a fault detection scheme that alerts the ring when a break occurs, i

Page 50 | AlliedWare™ OS How To Note: EPSRDebugging The master node continues sending Health messages out its primary port. It does not receive any of

Page 51 | AlliedWare™ OS How To Note: EPSRDebugging Now that the ring is back up, the master node blocks its secondary port for the data VLAN, transmi

Page 52 | AlliedWare™ OS How To Note: EPSRDebugging The master node continues transmitting and receiving Health messages for as long as the ring stays

Page 53 | AlliedWare™ OS How To Note: EPSRDebuggingTransit Node (Node B) Debug OutputThe following debugging shows the same events as the previous sec

Page 54 | AlliedWare™ OS How To Note: EPSRDebugging In the meanwhile, the master node has received a Link-Down message from the switch at the other en

Page 55 | AlliedWare™ OS How To Note: EPSRDebugging The transit node receives Health messages from the master node. These have a state of Failed, whic

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Page 6 | AlliedWare™ OS How To Note: EPSRHow EPSR Worksnew configuration, the nodes (master and transit) re-learn their layer 2 addresses. During this

Page 7 | AlliedWare™ OS How To Note: EPSRHow EPSR WorksRestoring Normal OperationMaster NodeOnce the fault has been fixed, the master node’s Health me

Page 8 | AlliedWare™ OS How To Note: EPSRHow To Configure EPSRHow To Configure EPSRThis section first outlines, step-by-step, how to configure EPSR. T

Page 9 | AlliedWare™ OS How To Note: EPSRHow To Configure EPSRIf you leave all the ring ports in the default VLAN (vlan1), they will create a loop, un