Lenovo ThinkSystem NE2552E, Application Manual

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NE2552E Application Guide for ENOS 8.4
9.
Configure the virtual link.
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 407 .
Other Virtual Link Options
 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.
Example 3: Summarizing Routes
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 413 ).
Figure 47.
Summarizing Routes
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.
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
Backbone Stub Area
Area 0
(0.0.0.0)
Summary Route
10.10.7.0/24
Network
IF 1
10.10.7.1
IF 2
36.128.192.1
Area 1
(0.0.0.1)
ABR
36.128.192.x to
36.128.254.x
36.128.192.0/18
Network