Information Technology Reference
In-Depth Information
Post-Release 12.0(19)S BGP Enhancements
The final test scenario involves upgrading the UUT to Cisco IOS Release 12.0(23). This
enables the use of BGP Update Packing and BGP read-only mode. These enhancements are
coupled with all the previously discussed features in this case study for determining the
optimal BGP convergence times.
The BGP feature status is as follows:
•
Peer groups are enabled.
•
Path MTU Discovery is enabled (TCP MSS 1460).
•
The input hold queue is 1000.
•
Update packing is enabled.
Figure 3-13 provides three important convergence scenarios: Baseline, Optimal Pre-12.0(19)S,
and Optimal Post-12.0(19)S.
Figure 3-13
Baseline, Pre-12.0(19)S, and 12.0(23)S Comparison
Base Line, Optimal Pre-12.0(19)S, Optimal 12.0(23)S Comparison
350
300
250
200
150
100
50
0
70, 000
80, 000
90,000
100, 000
110,000
120,000
130, 000
140, 000
158
178
195
227
244
256
277
315
Base Line
82
90
114
118
136
153
157
170
Optimal pre-12. 0(19)S
Configurat ion
Optimal Configuration 12. 0(23)S
36
41
54
65
78
93
107
129
Prefix Count
As previously stated, the improvement for optimal pre-Release 12.0(19)S over the baseline
is 45% on average. The improvement for optimal post-Release 12.0(19)S over optimal pre-
Release 12.0(19)S is an additional 43% on average.
The decrease in convergence time for an optimal configuration post-Release 12.0(19)S over
the baseline is 69% on average.
