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Revision 4 (Wentao Shang, 01/28/2014 01:59 PM) → Revision 6/44 (Wentao Shang, 01/28/2014 04:15 PM)
# NFD FIB Management Protocol
The **FIB management protocol** allows an entity to manipulate the FIB entry.
This protocol supports four operations:
* add a nexthop to a FIB entry
* remove a nexthop from a FIB entry
* set the forwarding strategy for a namespace
## Command format
The FIB management protocol uses Interest-Data exchange.
The command request and response formats are specified in [[ControlCommand|NFD Control Command specification]].
## Add a nexthop
**prefixreg** command adds a nexthop to a FIB entry,
or updates its cost if it already exists.
The command verb is **prefixreg**.
Request Interest must be signed.
The request options have the following format:
PrefixRegOptions ::= PREFIX-REG-OPTIONS-TYPE TLV-LENGTH
Name
FaceId
Cost
ForwardingFlags?
FaceId ::= FACEID-TYPE TLV-LENGTH
nonNegativeInteger
Cost ::= COST-TYPE TLV-LENGTH
nonNegativeInteger
ForwardingFlags ::= FORWARDING-FLAGS-TYPE COST-TYPE TLV-LENGTH
nonNegativeInteger
**FaceId** is the FaceId returned in *NFD Face Management protocol*.
If **FaceId** is set to zero, it is implied as the face of the entity sending this command.
The default value of **Cost** is zero.
The value of **ForwardingFlags** will be defined later.
The response has StatusCode 200 if the command succeeds.
## Remove a nexthop
**prefixunreg** command removes a nexthop from a FIB entry.
The command verb is **prefixunreg**.
Request Interest must be signed.
The request options have the following format:
PrefixUnregOptions ::= PREFIX-UNREG-OPTIONS-TYPE TLV-LENGTH
Name
FaceId
The response has StatusCode 200 if the command succeeds.
If the specified nexthop does not exist on the FIB entry, this command does nothing,
but is still considered successful.
## Set strategy
**prefixstrategy** command picks a forwarding strategy for a namespace.
The format of this command will be defined in a later version of this spec.
## TLV-TYPE assignments
Type | Assigned value | Assigned value (hex)
------------------------------------------- | ----------------- | --------------------
PrefixRegOptions | 129 | 0x81
PrefixUnregOptions | 129 | 0x81
FaceId | 132 | 0x84
ForwardingFlags | 138 | 0x8a
Cost | 63672 | 0xf8b8