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DHCPv4 relay counters
The purpose of this feature is to enhance the DHCP relay component in OS10 to include interface DHCP relay packet counters.
These counters are used to provide telemetry and debugging support.
Overview
The DHCPv4 relay agent maintains DHCPv4 relay counters per interface. These relay counters are configured for all the DHCP
packets that are processed by the DHCP client-connected interfaces. You must configure DHCPv4 relay or helper address for
the client-connected interfaces.
The DHCP relay counters provide visibility into the OS10 nodes DHCPv4 relay behavior in DHCPv4 relay use cases. These DHCP
relay counters also enable telemetry support for monitoring and debugging the DHCPv4 relay functionality.
DHCPv4 relay maintains the counters per interface only in client-connected interfaces where helper address is configured.
When the first helper address is configured on the interface, the DHCPv4 relay counters are initialized to 0 and the last clear
timestamp is updated.
Restrictions and limitations
The following restrictions and limitations apply to this feature:
● The DHCPv4 relay counters do not persist when system reloads occur. You must configure the counters after the system
reloads.
● In a VLT topology, each VLT node maintains its own DHCPv4 relay counter independently. Execution of any clear command
affects only the individual node.
● The DHCPv4 relay agent maintains a counter per interface only in client-connected interfaces where helper address is
configured.
● The show commands display only the DHCP counter statistics of the interface that are configured with the helper address.
● Each counter is 64 bits long; so, when the DHCPv4 relay counter reaches its maximum value of 2^64, it resets to zero. A
system log message is also delivered by the system.
● Interface level counters are reset to 0 when the first helper address is configured in the interface.
● For DHCP unicast messages, the DHCPv4 relay agent counters are valid only if server-identifier-override is enabled.
● The DHCPv4 relay counters for the PVLAN secondary VLANs are maintained in PVLAN primary VLAN. This limitation applies
because the secondary VLANs are L2 VLANs where DHCPv4 helper address configuration is not allowed.
● To deliver the DHVPv4 relay counter statistics, the system takes up to a maximum of 1 minute.
System management
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