HP HPE FlexNetwork MSR Router Series, Руководство по настройке

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mode and the other in node protection mode. Automatically created bypass tunnels can be
used to protect any type of CT, but they cannot provide bandwidth protection.
A primary tunnel can have both manually configured and automatically created bypass tunnels. The
PLR will select one bypass tunnel to protect the primary CRLSP. The selected bypass tunnel is
bound to the primary CRLSP.
Manually created bypass tunnels take precedence over automatically created bypass tunnels. An
automatically created bypass tunnel in node protection mode takes precedence over an
automatically created bypass tunnel in link protection mode. Among manually created bypass
tunnels, the PLR selects the bypass tunnel for protecting the primary CRLSP by following these
rules:
1. Selects a bypass tunnel according to the principles, as shown in Table 2 .
2. Prefers the bypass tunnel in node protection mode over the one in link protection mode.
3. Prefers the bypass tunnel with a smaller ID over the one with a bigger tunnel ID.
Table 2 FRR protection principles
Bandwidt
h required
by
primary
CRLSP
Primary
CRLSP
requires
bandwidth
protection or
not
Bypass tunnel providing
bandwidth protection Bypass tunnel providing no
bandwidth protection
0
Yes
The primary CRLSP cannot be
bound to the bypass tunnel.
The primary CRLSP can be bound
to the bypass tunnel if CT 0 or no
CT is specified for the bypass
tunnel.
After binding, the RRO message
does not carry the bandwidth
protection flag. The bypass tunnel
does not provide bandwidth
protection for the primary CRLSP,
and performs best-effort
forwarding for traffic of the primary
CRLSP.
No
None-zero Yes
The primary CRLSP can be
bound to the bypass tunnel when
all the following conditions are
met:
•
The bandwidth that the
bypass tunnel can protect is
no less than the bandwidth
required by the primary
CRLSP.
•
There is not a CT specified
for the bypass tunnel, or the
specified CT is the same as
that specified for the primary
CRLSP.
After binding, the RRO message
carries the bandwidth protection
flag, and the bypass tunnel
provides bandwidth protection for
the primary CRLSP.
The primary CRLSP prefers
bypass tunnels that provide
bandwidth protection over those
providing no bandwidth
protection.
The primary CRLSP can be bound
to the bypass tunnel when one of
the following conditions is met:
•
No CT is specified for the
bypass tunnel.
•
The specified CT is the same
as that specified for the
primary CRLSP.
After binding, the RRO message
does not carry the bandwidth
protection flag.
This bypass tunnel is selected only
when no bypass tunnel that
provides bandwidth protection can
be bound to the primary CRLSP.