nx.os.and.cisco.nexus.switching.2nd.edition.1587143046

Process ID DataCenter1 VRF default, Instance ID 0,
area 0.0.0.0
Enabled by interface configuration
State DR, Network type BROADCAST, cost 40
Index 1, Transmit delay 1 sec, Router Priority 1
Designated Router ID: 192.168.205.1, address:
fe80::21b:54ff:fec2:ab41
No backup designated router on this network
0 Neighbors, flooding to 0, adjacent with 0
Timer intervals: Hello 10, Dead 40, Wait 40,
Retransmit 5
Hello timer due in 00:00:05
Number of link LSAs: 1, checksum sum 0x3755
The last step is to configure optional summarization and redistribution. One important item
to consider is that both summarization and redistribution for OSPFv3 must be configured for
the address-family ipv6 unicast subconfiguration.
Note
Specific configuration is outside of the scope of this book; however, you can find
more information in the “Configuring OSPFv3” section of the Cisco Nexus 7000
Series NX-OS Unicast Routing Configuration Guide, Release 5.x, which is
available at http://tinyurl.com/cp7wlbh.
IS-IS
IS-IS is an Interior Gateway Protocol (IGP) based on Standardization (ISO)/International
Engineering Consortium (IEC) 10589. Like OSPF, IS-IS is a link-state routing protocol that
uses a link state database that describes the state of the network. It uses information from
this database to calculate the best, loop-free path to other devices on the network. IS-IS also
uses an area concept; however, IS-IS defines two area types: Level 1 (nonbackbone) or
Level 2 (backbone). A Level 1 router establishes adjacencies with other Level 1 routers
within a local area (intra-area routing), whereas a Level 2 router builds adjacencies to other
Level 2 routers and routes between different Level 1 areas (interarea routing).
IS-IS Configuration
The Cisco Nexus 7000 series switches support using IS-IS as an IGP routing protocol. At
the time of this writing, the Nexus 5500 series switches do not support using IS-IS as a
routing protocol. Each IS-IS instance in Cisco NX-OS supports either a single Level 1 or
Level 2 area, or one of each. By default, all IS-IS instances automatically support Level 1
and Level 2 routing. At the time of this writing, NX-OS for the Nexus 7000 supports IPv4 or
IPv6 single topology routing.
Enabling IS-IS is a multistep process that is covered in detail. The following is a quick
listing of steps to enable a basic configuration of IS-IS: