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© Calix. All Rights Reserved.
Note:
The default Calix format will have a defining letter for the port (x,g,v,etc) followed
by the port number. The TR101 format will have a defining letter for the port followed
by the port number, except for the VDSL ports which will be only the port number (no
leading letter 'v').
Downstream (server to client) DHCP packets
will be captured and examined on Trusted
interfaces.
If a session match is found for an interface, the Option 82/LDRA string is removed if
Option 82/LDRA is enabled globally, and then the packet is delivered to the Ethernet,
xDSL, or ONT Ethernet port interface where the lease request originated.
If a session match is not found, the DHCP packet will be forwarded unchanged on either
the port for which the MAC is learned, or on all "Trusted" interfaces belonging to the
VLAN (in case of broadcast DHCP packets).
All packets received on Untrusted interfaces that already have DHCP Relay Agent
information will be dropped.
Configuration guidelines
The following additional constraints only affect VLANs with DHCP Snooping that are
provisioned on Ethernet and xDSL port interfaces and where the global DHCP relay Option
82/LDRA is enabled:
DHCP snooping and Option 82/LDRA are not supported on the Management VLAN.
Ethernet interfaces used for LAG or ERPS links cannot be set to “Untrusted.”
If a line card reboot or reset occurs, the DHCP lease database for all ports (xDSL,
GE/10GE, GPON) persists.
The following guidelines apply to LDRA only:
LDRA cannot be enabled independently from Option 82.
LDRA is automatically enabled on any VLAN with DHCP Snoop enabled.
LDRA is supported for data services on VLAN per Service models only.
IPv6 residential gateways (RGs) are required for the VLAN per Service data model.
Access interfaces support IPv6 transparency only (no LDRA or NDP flood control) for
TLAN point-to-point, TLAN multi-point, and VLAN-per-port topologies.
E7-2 and E3-48C 10GE and E5-48 and E5-48C GE access interfaces support LDRA,
but are not expected to be subscriber-facing.
Edge interfaces do not support LDRA on received RELAY-FORWARD and RELAY-
REPLY messages.
