Allied Telesis 86251-08 manual Ping Polling of Device Reachability

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SHOW IP ADVERTISE

Patch Release Note

Note that IPv6 multicast packets will flood the VLAN when MLD snooping is disabled.

To enable MLD snooping, use the command:

ENABLE MLDSNOOPING

To display debugging information, use the command:

ENABLE MLDSNOOPING DEBUG

This command displays the ports that are currently receiving MLD packets and the ports that are being added or taken off the switch’s multicast group membership registration.

To disable debugging, use the command:

DISABLE MLDSNOOPING DEBUG

To display information about MLD snooping, use the command:

SHOW MLDSNOOPING COUNTER

For more information, including limitations on which addresses and packet types can be snooped, see the IPv6 Multicasting chapter of the Software Reference.

Ping Polling of Device Reachability

This enhancement enables the router or switch to regularly check whether or not it can reach a device. It also enables a trigger to activate on the router or switch when the device becomes unreachable. While the device is unreachable, the router or switch continues to monitor the device’s reachability, and another trigger can be set to activate when the device becomes available again. For example, the first trigger’s script could open and configure an alternative link if the device at the other end of a preferred link became unavailable. The second trigger’s script would automatically return traffic to the preferred link as soon as it was available again.

To determine the device’s reachability, the router or switch will regularly send ICMP Echo Request packets (“pings”) to the device. As long as the router or switch receives ping responses from the device, it considers the device to be reachable. After the router or switch has not received a reply to a set number of ICMP Echo Requests, it considers the device to be unreachable. It continues to try to ping the device, at an increased rate. After it receives a set number of responses, it considers the device to be reachable again.

Configuring the router or switch to determine a device’s reachability and respond to changes in reachability involves the following steps:

■Create a polling instance, to periodically ping the device

■Create scripts to run when the device becomes unreachable and when it becomes reachable again

■Configure triggers to run these scripts.

Patch 86251-08 for Software Release 2.5.1 C613-10356-00 REV I

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Contents Patch For Rapier Series Switches IntroductionPCR 03359 Module Core Level FeaturesPCR Module IPG Level PCR Module BGP LevelPCR Module STP Level PCR 03684 Module Core LevelPCR Module TTY, User Level PCR Module FIRE, Utility LevelPCR Module SW56 Level PCR Module Isakmp LevelPCR Module Ipsec Level PCR Module Firewall LevelPCR 31001 Module Dhcp Level PCR Module SWI LevelPCR Module IGP Level PCR Module Utility LevelPCR Module BGP Level PCR Module FFS Level PCR 31081 Module VRRP, IP, TCP, TelnetPCR Module File Level PCR 31098 Module Dhcp LevelPCR 02414 Module IPV6, SWI, IPG, Vlan PCR 31106 Module MLD LevelPCR Module IPX2 Level PCR Module IPGPCR Module ETH, IPG, IPv6, IPX Level PCR Module OSPF, IPG LevelPCR 03751 Module Mlds Level PCR Module ETH Level PCR Module FILE, INSTALL, SCR LevelPCR Module Install Level PCR 03801 Module Mlds LevelPCR 03823 Module Vlan Level PCR 03843 Module Dhcp LevelPCR Module DHCP, Telnet Level PCR Module IPG, IPV6 LevelPCR 03870 Module SWI, Vlan Level PCR Module TTY LevelPCR Module IP ARP Level PCR Module Switch LevelPCR Module Ikmp Level PCR Module Firewall Network affecting No PCR Module Ospf Network affecting No PCR Module L2TP LevelPCR Module PPP Level PCR Module PRI LevelPCR 03515 Module Dhcp Level PCR Module HTTP, Firewall Level PCR Module BGP, TCP LevelPCR 03547 Module Dhcp Level PCR Module Http Level PCR 03584 Module MLD Level PCR Module FIREWALL, IPG LevelPCR Module Ping Level PCR 03618 Module Dhcp Level PCR 03615 Module Load LevelPCR Module STP, SWI Level PCR 03647 Module Snmp Level PCR 03698 Module Dvmrp Level PCR Module PKI LevelPCR 03691 Module Dvmrp Level PCR 03708 Module Dhcp LevelPCR Module PPP, VJC Level PCR Module IP LevelPCR Module Vrrp Level PCR Module Rsvp LevelFeatures PCR Module IPSEC, Ikmp Level PCR 03371 Module Dhcp LevelPCR Module SSL Level PCR 03424 Module Dhcp Level PCR 03405 Module Stream LevelPCR 03410 Module VLAN, Core Level PCR 03429 Module SWI, Vlan LevelPCR 03443 Module Dhcp Level PCR 03436 Module IP, Dhcp LevelPCR Module IPX Level PCR Module FR LevelPCR 03465 Module Dhcp Level PCR 03492 Module HTTP, Load Level PCR Module BGP, Firewall LevelPCR 03515 Module Dhcp Level PCR 03089 Module Core Level PCR 02577 Module IPG, LOG LevelPCR Module GUI Level PCR 03094 Module STP, Vlan LevelPCR 03109 Module LOG Level PCR 03096 Module Vlan LevelPCR Module PIM, DVMRP, IPG Level PCR Module Classifier LevelPCR Module Cure Level PCR Module ETH, IPG LevelPCR Module IPG, SWI Level PCR Module Port LevelPCR Module PCI Level PCR 03153 Module ACC LevelPCR 03167 Module Dvmrp Level PCR Module LB Level PCR Module CORE, FFS, TTY LevelPCR Module FIREWALL, LB Level PCR Module User LevelPCR 03205 Module Dhcp Level PCR 03229 Module Load LevelPCR Module SWI, IPG, PIM Level PCR 03239 Module QOS LevelPCR 03247 Module MVR Level PCR 03256 Module MLD Level PCR Module VLAN, IPG LevelPCR Module DHCP, Q931, Telnet Level PCR 03346 Module Snmp Level PCR 03334 Module MVR LevelPCR 03336 Module Core Level PCR Module IP, SWI LevelPCR 03370 Module MVR Level VlanPCR 03388 Module Dhcp Level ADD PPP Create PPP Delete PPP SET PPP Show PPP PCR 03077 Module Core Level PCR 03067 Module Dhcp LevelPCR 03068 Module SWI, QOS Level PCR Module IPV6 Network affecting NoPCR Module PCI Network affecting No PCR Module SWI Network affecting NoPCR Module IPG Network affecting No PCR Module IPG, ETH Network affecting NoPCR Module TCP Network affecting No Availability Icmp Router Discovery AdvertisementsPCR Module TELNET, PING, IPV6, Network affecting No PCR Module TM Network affecting NoRouter Advertisement Messages To change these settings, use one of the commands ADD IP Interface SET IP Interface Disable IP Advertise Enable IP AdvertiseADD IP Advertise Interface Delete IP Advertise Interface SET IP Advertise Interface Example output from the Show IP Advertise command Show IP Advertise Same subnet Adopting the Vrrp IP Address MLD Snooping Ping Polling of Device Reachability Down device unreachable Enable and Disable Icmp Messages Icmp RedirectCommands Disable IP IcmpreplyStatic Igmp Show IP IcmpreplyConfiguration Example Commands Show IP IgmpSee Also Show IP Igmp Debug ADD IP Igmp Destination Create IP Igmp Destination Delete IP Igmp Destination Destroy IP Igmp DestinationDisable IP Igmp Debug Enable IP Igmp DebugChecking the Port Map on Rapier16fi Switches Show IP Igmp DebugHow to check that the port map is correct How to restore the correct port map PPPoE Client on Vlan Interfaces Force Eprom download Y ?ADD PPP Create PPP Delete PPP SET PPPVLANn-servicename, TNL- callname Show PPPShow PPP
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