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Cyclades-PR4000
Chapter 11 - Routing Protocols 106
STEP TWO
The neighbor menu identifies the routers inside and outside the AS that will communicate with the router via BGP-
4. Each update message exchanged between routers contains path attributes. How these path attributes are
manipulated by the router when routes are received or sent to each neighbor is determined here.
CONFIG=>IP=>BGP4=>NEIGHBOR=>ADD
Parameter Description
Name A string to facilitate identification of the Neighbor. In the example above, the names
Popeye and Brutus could be used.
IP Address The IP address at the other end of the connection. For AS 747, the value is
100.100.100.2.
Description Another string to identify the Neighbor.
AS Number The AS number assigned to the neighbor.
Maximum routes When set, indicates the maximum number of routes accepted from this neighbor.
Source IP Address When this number is set, the protocol accepts TCP/BGP connections only when the
destination IP is this value. For Popeye, the value would be 100.100.100.1.
Passive Causes the router to not initiate BGP connections with this neighbor.
Transparent-AS
Yes
causes the router to NOT include its own AS number in the "AS Path" path
attribute for update messages sent to this neighbor.
Transparent-NextHop
Yes
causes the router to NOT alter the "NextHop" path attribute for update messages
sent to this neighbor.
NextHop Self
Yes
causes the router to change the NextHop path attribute for update messages sent
to this neighbor. The value is replaced by the Source IP Address set above.
Route Reflector Client Indicates that this router is a route reflector and the neighbor is a route reflector client.
Weight Indicates the relative importance of the routes received from this neighbor. Routes
with greater weights are chosen over routes with lesser weights.
Maximum-Prefix When set, indicates the maximum number of routes that the router will accept in a
single update message from this router.
Holdtime When a message is not received from this neighbor for the holdtime, the neighbor is
considered inactive.
This table is continued.