Example 3: Summarizing Routes - Lenovo RackSwitch G8264 Application Manual

Example 3: Summarizing Routes

1. Configure IP interfaces for each network which will be attached to OSPF areas.
2. Enable OSPF.
576
G8264 Application Guide for ENOS 8.4
By default, ABRs advertise all the network addresses from one area into another
area. Route summarization can be used for consolidating advertised addresses and
reducing the perceived complexity of the network.
If network IP addresses in an area are assigned to a contiguous subnet range, you
can configure the ABR to advertise a single summary route that includes all
individual IP addresses within the area.
The following example shows one summary route from area 1 (stub area) injected
into area 0 (the backbone). The summary route consists of all IP addresses from
36.128.192.0 through 36.128.254.255 except for the routes in the range 36.128.200.0
through 36.128.200.255.
Figure 54. Summarizing Routes
Notes:
 OSPFv2 supports IPv4 only. IPv6 is supported in OSPFv3 (see "OSPFv3
Implementation in Enterprise NOS" on page
 You can specify a range of addresses to prevent advertising by using the hide
option. In this example, routes in the range 36.128.200.0 through 36.128.200.255
are kept private.
Use the following procedure to configure OSPF support as shown in Figure
RS G8264(config)# interface ip 1
RS G8264(config­ip­if)# ip address 10.10.7.1
RS G8264(config­ip­if)# ip netmask 255.255.255.0
RS G8264(config­ip­if)# vlan 10
RS G8264(config­ip­if)# enable
RS G8264(config­ip­if)# exit
RS G8264(config)# interface ip 2
RS G8264(config­ip­if)# ip address 36.128.192.1
RS G8264(config­ip­if)# ip netmask 255.255.255.0
RS G8264(config­ip­if)# vlan 20
RS G8264(config­ip­if)# enable
RS G8264(config­ip­if)# exit
RS G8264(config)# router ospf
RS G8264(config­router­ospf)# enable
578).
54: