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Caption
0Table
1SBC Probing Mechanism Types

 

Probing MechanismSBC PlatformsAffected PortsPurpose
Physical link detection

All

All ports on both active and backup CEs
  • Detects the presence of the port cable and that the adjacent device is powered on (enabled by default on all physical ports configured by Link Monitor except for any ports administratively disabled or set out-of-service).
  • Reports any hardware failures to NRS and Link Verification Manager (LVM) tasks.
ICMP pingAllActive ports only

Checks two-way connectivity between 

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port and the configured destination (adjacent router) by sending ICMP Ping messages at configured intervals to the destination.

 

Note
When destination IP address is configured in a Link Monitor, ICMP Ping is enabled along with physical link detection. By setting the destination IP address to NULL (0.0.0.0), only physical link detection can be enabled. 
ARP ACD/ICMPv6 NUD*SBC 7000 only

Standby ports only

Verifies physical media by checking two-way traffic through at least the local Ethernet interface, the cable, and the adjacent layer 2/3 switching function.

Layer 3 verification is accomplished using ARP ACD Probes (for IPv4) or Neighbor Discovery (for IPv6) mechanisms to probe an arbitrary, operator-specified target IP address on a local IP subnet, typically the address of the next-hop router (Gateway IP address). Depending on the address family (IPv4/IPv6) of the gateway IP address configured, either ARP ACD or ICMPv6 NUD probing messages are sent in such a way that explicit assignments of IP addresses to the standby ports are not required. See below for specifics on IPv4 ARP ACD requirements.

When IP Target is to 0.0.0.0 and/or “probeOnStandby” is disabled, only the physical link state between active/standby

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port and the adjacent router is monitored.

*  Address Resolution Protocol - Address Conflict Detection / Internet Control  Message Protocol Version 6 – Neighbor Unreachability Detection

ARP ACD/ICMPv6 NUD Methods for Standby Ports

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