... bits.
15
CIDR and Route Summarization
The 19 2 .16 8.0.0/20, summarized or aggregated route includes all the
networks belonging to customers A, B, C, and D.
19 2 .16 8.0.0/23, 19 2 .16 8.2.0/23, 19 2 .16 8.4.0/22, ... 19 2 .16 8.2.0/23, 19 2 .16 8.4.0/22, and 19 2 .16 8.8.0/ 21 are all
subnets of 19 2 .16 8.0.0/20
21
Any of these /16 subnets can be subnetted further...
... from R3:
Connected to neighbor R1 on network 10 .3.0.0 /16 , cost of 5
Connected to neighbor R4 on network 10 .7.0.0 /16 , cost of 10
Has a network 10 .6.0.0 /16 , cost of 2
R1 Processes the LSPs from R3
Red: ... discussed in the following
chapter.
37
20
10
Determining the
Shortest Path
Network 10 .9.0.0 /16
via R2 Serial 0/0/0
at a cost of 30
11
Link-State Routing Process
1...
... its routing table that
l matches 19 2 .16 8 .1. 1, which is the ping packet’s destination IP address.
R2# ping 19 2 .16 8 .1. 1
!!!!
R2# show ip route
17 2 .16 .0.0/24 is subnetted, 2 subnets
C 17 2 .16 .1. 0 ... communicate with any device on the 17 2 .16 .3.0/24 and
17 2 .16 .2.0/24 networks.
Ÿ R2 can communicate with any device on the 17 2 .16 .1. 0/24,
17 2 .16 .2.0/24, and...
... an update about networks 10 .1. 0.0 with a metric of 2 (new) and
10 .2.0.0 with a metric of 1 out the Serial 0/0 /1 interface.
Receives an update from R1 about network 10 .1. 0.0 on Serial 0/0/0. ... Stores network 10 .1. 0.0 in the routing table with a metric of 1
Receives an update from R3 about network 10 .4.0.0 on Serial 0/0 /1
with a metric of 1
Stores network 10...