Cisco CCNA Certification Exam Tutorial Distance Vector Command Review

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Cisco CCNA Certification Exam Tutorial: Distance Vector Command Review

Summary

Mastering the CCNA exam requires familiarity with numerous commands. This guide offers a review of key distance vector and static routing commands, showcasing their usage and console output, courtesy of Chris Bryant, CCIE

12933.

Keywords

CCNA, certification, exam, distance vector, command, review, IP, route, static routing

Article

Preparing for the CCNA exam involves memorizing a multitude of commands. This review highlights essential distance vector and static routing commands, demonstrating their usage and console output.

Bandwidth Command

IGRP assumes any Serial interface is connected to a T1 line running at 1544 KBPS. Since equal-cost load balancing is enabled by default, this assumption may be inaccurate. To modify IGRP's assumption, use the `bandwidth` command on the specific serial interface. Note: this does not affect actual bandwidth but changes IGRP's assumption.

```plaintext
R2

conf t

R2(config)

int s0

R2(config-if)

bandwidth 512

```

Clear IP Route

The command `clear ip route *` clears non-static and non-connected routes from your routing table. In a lab environment, it's useful for forcing routers to send and request updates outside their regular schedule.

```plaintext
R2

clear ip route *

```

Debug IP IGRP Events

Use `debug ip igrp events` to monitor IGRP updates. When the routing table is cleared, routers actively broadcast update requests.

```plaintext
R2

debug ip igrp event

IGRP event debugging is on
R2

clear ip route *

06:02:51: IGRP: broadcasting request on BRI0
06:02:51: IGRP: broadcasting request on Serial0.123
```

Debug IP IGRP Transactions

To configure IGRP unequal-cost load-sharing, know the metrics of less-desirable routes, which are not found in IGRP's topology table. Use `debug ip igrp transactions` to obtain these metrics, clearing the routing table with `clear ip route *` to force updates.

```plaintext
R2

debug ip igrp transactions

IGRP protocol debugging is on
R2

clear ip route *

06:05:33: IGRP: received update from 172.12.123.1 on Serial0.123
06:05:33: subnet 172.12.123.0, metric 10476 (neighbor 8476)
06:05:33: network 1.0.0.0, metric 8976 (neighbor 501)
```

Debug IP RIP

For troubleshooting routing update and authentication issues, use `debug ip rip`. Clearing the routing table with `clear ip route *` forces a RIP update.

```plaintext
R2

debug ip rip

IP protocol debugging is on
R2

clear ip route *

6:14:53: RIP: received v2 update from 172.23.23.3 on Ethernet0
6:14:53: 172.12.123.0/24 via 0.0.0.0 in 1 hop
```

IP Route

To set up a static route to a destination IP address, use the `ip route` command. Follow the destination with a subnet mask and either the next-hop IP or the local router's exit interface.

```plaintext
R2

conf t

R2(config)

ip route 1.1.1.1 255.255.255.255 172.12.123.1

OR
R2(config)

ip route 1.1.1.1 255.255.255.255 serial0

```

Default Static Route

Configure a default static route with:

```plaintext
R2

conf t

R2(config)

ip route 0.0.0.0 0.0.0.0 172.12.123.1

OR
R2(config)

ip route 0.0.0.0 0.0.0.0 ethernet0

```

The `0.0.0.0 0.0.0.0` signifies the default route, meaning any destination will match this statement.

Stay tuned for Part II of this CCNA exam command review!

You can find the original non-AI version of this article here: Cisco CCNA Certification Exam Tutorial Distance Vector Command Review.

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