© Copyright Lenovo 2016
Chapter 4: Configuration Commands
557
Border Gateway Protocol Configuration
Border
Gateway
Protocol
(BGP)
is
an
Internet
protocol
that
enables
routers
on
a
network
to
share
routing
information
with
each
other
and
advertise
information
about
the
segments
of
the
IP
address
space
they
can
access
within
their
network
with
routers
on
external
networks.
BGP
allows
you
to
decide
what
is
the
“best”
route
for
a
packet
to
take
from
your
network
to
a
destination
on
another
network,
rather
than
simply
setting
a
default
route
from
your
border
router(s)
to
your
upstream
provider(s).
You
can
configure
BGP
either
within
an
autonomous
system
or
between
different
autonomous
systems.
When
run
within
an
autonomous
system,
it
ʹ
s
called
internal
BGP
(iBGP).
When
run
between
different
autonomous
systems,
it
ʹ
s
called
external
BGP
(eBGP).
BGP
is
defined
in
RFC
1771.
BGP
commands
enable
you
to
configure
the
switch
to
receive
routes
and
to
advertise
static
routes,
fixed
routes
and
virtual
server
IP
addresses
with
other
internal
and
external
routers.
In
the
current
Enterprise
NOS
implementation,
the
RackSwitch
G8332
does
not
advertise
BGP
routes
that
are
learned
from
one
iBGP
speaker
to
another
iBGP
speaker
.
BGP
is
turned
off
by
default.
Note:
Fixed
routes
are
subnet
routes.
There
is
one
fixed
route
per
IP
interface.
Table 296.
Border
Gateway
Protocol
Options
Command Syntax and Usage
router
bgp
Enter
Router
BGP
configuration
mode.
Command
mode:
Global
configuration
aggregate
address
<1
‐
16>
Configures
aggregation
IP
address.
To
view
command
options,
see
Command
mode:
Router
BGP
as
<0
‐
65535>
Set
Autonomous
System
number.
Command
mode:
Router
BGP
[no]
asn4comp
Enables
or
disables
ASN4
to
ASN2
compatibility.
Command
mode:
Router
BGP
[no]
bestpath
as
path
multipath
relax
Changes
the
default
best
path
selection
configuration
by
allowing
load
sharing
across
different
AS
‐
paths
of
equal
length.
Command
mode:
Router
BGP
[no]
client
to
client
reflection
Enables
or
disables
client
‐
to
‐
client
IBGP
route
reflection
when
operating
as
a
route
reflector.
The
default
state
is
enabled
.
Command
mode:
Router
BGP
Summary of Contents for RackSwitch G8332
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