Information Technology Reference
In-Depth Information
Example 2-11
Example of
show interface
statistics
router#show interface statistics
Serial5/0
Switching path Pkts In Chars In Pkts Out Chars Out
Processor 1512063 80735470 1512064 80865400
Route cache 0 0 0 0
Total 1512063 80735470 1512064 80865400
The command shown in Example 2-12 gives more detail and lists information for each
protocol. Three types of protocols are listed: IP, CDP, and others. All packets are process-
switched in this example.
Example 2-12
Example of
show interface switching
router#show interface switching
Serial5/0
...
Protocol Path Pkts In Chars In Pkts Out Chars Out
Other Process 0 0 951854 15229544
Cache misses 0
Fast 0 0 0 0
Auton/SSE 0 0 0 0
IP Process 480877 35602293 480869 35727362
Cache misses 100
Fast 0 0 0 0
Auton/SSE 0 0 0 0
CDP Process 79323 29903377 79331 29907805
Cache misses 0
Fast 0 0 0 0
Auton/SSE 0 0 0 0
Case Study: BGP Memory Use Estimation
The purpose of this case study is to demonstrate the interdependency of various compo-
nents that contribute to BGP memory use, specifically with regard to the BGP Router
process. The case study also establishes a simple method to estimate the BGP memory
requirements based on a defined number of prefixes and paths. An experimental approach
is used to determine the various relationships between BGP components and their memory
use. The total memory consumed by BGP is the sum of memory use for BGP networks (pre-
fixes), BGP paths, BGP path attributes, IP NDB, IP RDB, and IP CEF. The results should
provide a reasonable estimate of BGP memory use in Cisco Internet routers.
