Information Technology Reference
In-Depth Information
Figure 3-8 shows the results of the testing.
Figure 3-8
Peer Group Convergence Statistics
Peer Groups Convergence
250
1600
1400
200
1200
1000
150
800
100
600
400
50
200
0
0
70, 000
80, 000
90,000
100, 000
110, 000
120, 000
130, 000
140, 000
123
138
148
170
192
202
216
229
Convergence Times
705
775
854
904
1076
1144
1263
1343
Input Drop Count
Prefix Count
Convergence Times
Input Drop Count
The convergence time for the BGP peers continues to be linear. The convergence time has
decreased with the deployment of peer groups by an average of 22%. The input drop rate,
however, has increased dramatically. This increase in the input drop rate is a result of the
update replication improving to the router's update generation efficiency.
Peer Groups and Path MTU Discovery
The Path MTU Discovery (PMTUD) feature is enabled in addition to peer groups. This
should reduce the number of BGP update packets required and also the number of input
drops.
The BGP feature status is as follows:
•
Peer groups are enabled.
•
Path MTU Discovery is enabled (TCP MSS 1460).
•
The input hold queue is 75.
•
Update packing is not supported.
