28.06.2014 Views

Discussion

Discussion

Discussion

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

TLVs:<br />

Area address: 49.0020 (3)<br />

...<br />

Check the interface’s MTU to make sure that it is at least 1,492 bytes:<br />

aviva@RouterG> show interfaces fe-0/0/1.0<br />

Logical interface fe-0/0/1.0 (Index 64) (SNMP ifIndex 40)<br />

Flags: SNMP-Traps Encapsulation: ENET2<br />

Protocol inet, MTU: 1500<br />

Flags: None<br />

Addresses, Flags: Is-Preferred Is-Primary<br />

Destination: 10.0.1/24, Local: 10.0.1.2, Broadcast: 10.0.1.255<br />

Protocol iso, MTU: 1497<br />

Flags: Is-Primary<br />

Another common mistake that results in adjacency being down is that the IP<br />

addresses on either end of the connection are in different subnets and do not match.<br />

An example is having one router interface with an IP address of 192.168.0.1/24 connect<br />

to another router with an interface IP address of 192.168.1.2/24.<br />

Finally, check that each interface includes an ISO family and that the lo0 interface<br />

has an NET address:<br />

aviva@RouterG> show interfaces terse<br />

Interface Admin Link Proto Local Remote<br />

...<br />

fe-0/0/1.0 up up inet 10.0.1.2/24<br />

iso<br />

fe-1/0/0 up up<br />

fe-1/0/0.0 up up inet 10.0.16.2/24<br />

iso<br />

...<br />

lo0.0 up up inet 192.168.19.1 --> 0/0<br />

iso 49.0020.1921.6801.9001<br />

...<br />

11.2 Viewing the IS-IS Link-State Database<br />

Problem<br />

You want to look at each router’s link-state database to make sure that all the IS-IS<br />

routers know about each other.<br />

Solution<br />

Use the show isis database command to view the contents of the link-state database:<br />

aviva@RouterG> show isis database<br />

IS-IS level 1 link-state database:<br />

LSP ID<br />

Sequence Checksum Lifetime Attributes<br />

RouterG.00-00 0x65 0xfa35 851 L1 L2 Attached<br />

RouterA.00-00 0x5e 0xf289 661 L1 L2<br />

356 | Chapter 11: IS-IS<br />

This is the Title of the Book, eMatter Edition<br />

Copyright © 2008 O’Reilly & Associates, Inc. All rights reserved.

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!