Other Virtual Link Options; Example 3: Summarizing Routes - Lenovo ThinkSystem NE2552E Application Manual

9. Configure the virtual link.

Other Virtual Link Options

Example 3: Summarizing Routes

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NE2552E Application Guide for ENOS 8.4
The nbr router ID configured in this step must be the same as the router ID that
was configured for switch #1 in Step 2 on page
NE2552E(config)# router ospf
NE2552E(config-router-ospf)# area-virtual-link 1 area 1
NE2552E(config-router-ospf)# area-virtual-link 1 neighbor-router
10.10.10.1
NE2552E(config-router-ospf)# area-virtual-link 1 enable
 You can use redundant paths by configuring multiple virtual links.
 Only the endpoints of the virtual link are configured. The virtual link path may
traverse multiple routers in an area as long as there is a routable path between
the endpoints.
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 the 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
the 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.
Note:
OSPFv2 supports IPv4 only. IPv6 is supported in OSPFv3 (see "OSPFv3
Implementation in Lenovo ENOS" on page
Figure 47. Summarizing Routes
Backbone
(0.0.0.0)
Summary Route
10.10.7.0/24
Note: 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.
413).
Area 0
IF 1
10.10.7.1
ABR
Network
407.
Stub Area
Area 1
(0.0.0.1)
IF 2
36.128.192.1
36.128.192.x to
36.128.254.x
36.128.192.0/18
Network