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doc: extend documentation of SRv6 locator

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This commit adds the documentation of the two optional parameters "block-len" and "node-len" of the SRv6 locator.

Signed-off-by: Carmine Scarpitta <carmine.scarpitta@uniroma2.it>
This commit is contained in:
Carmine Scarpitta 2022-07-23 18:48:42 +02:00
parent b71e1a520e
commit bd2a1bdec7
1 changed files with 24 additions and 1 deletions
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doc/user/zebra.rst
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@ -745,7 +745,7 @@ and this section also helps that case.
Create a new locator. If the name of an existing locator is specified,
move to specified locator's configuration node to change the settings it.
.. clicmd:: prefix X:X::X:X/M [func-bits (0-64)]
.. clicmd:: prefix X:X::X:X/M [func-bits (0-64)] [block-len 40] [node-len 24]
Set the ipv6 prefix block of the locator. SRv6 locator is defined by
RFC8986. The actual routing protocol specifies the locator and allocates a
@ -764,10 +764,33 @@ and this section also helps that case.
configure the locator's prefix as ``2001:db8:1:1::/64``, then default SID
will be ``2001:db8:1:1:1::``)
This command takes three optional parameters: ``func-bits``, ``block-len``
and ``node-len``. These parameters allow users to set the format for the SIDs
allocated from the SRv6 Locator. SID Format is defined in RFC 8986.
According to RFC 8986, an SRv6 SID consists of BLOCK:NODE:FUNCTION:ARGUMENT,
where BLOCK is the SRv6 SID block (i.e., the IPv6 prefix allocated for SRv6
SIDs by the operator), NODE is the identifier of the parent node instantiating
the SID, FUNCTION identifies the local behavior associated to the SID and
ARGUMENT encodes additional information used to process the behavior.
BLOCK and NODE make up the SRv6 Locator.
The function bits range is 16bits by default. If operator want to change
function bits range, they can configure with ``func-bits``
option.
The ``block-len`` and ``node-len`` parameters allow the user to configure the
length of the SRv6 SID block and SRv6 SID node, respectively. Both the lengths
are expressed in bits.
``block-len``, ``node-len`` and ``func-bits`` may be any value as long as
``block-len+node-len = locator-len`` and ``block-len+node-len+func-bits <= 128``.
When both ``block-len`` and ``node-len`` are omitted, the following default
values are used: ``block-len = 24``, ``node-len = prefix-len-24``.
If only one parameter is omitted, the other parameter is derived from the first.
::
router# configure terminal