RIP & EIGRP

Question 1

RIP Characteristics

Answer 1

Distance Vector IGP
Metric = Hop count (max 15)

Performs ECMP (up to 4 paths by default)

Question 2

RIPv1 Characteristics

Answer 2

Legacy
VLSM not supported (no subnet mask info sent with routing updates)

Updates sent every 30 sec as broadcast traffic

Question 3

RIPv2 Characteristics

Answer 3

Supports VLSM
Supports authentication

Uses multicast (224.0.0.9)

Question 4

RIPv2 Configuration

Answer 4

From global config:
Router rip
Version 2
Network 10.0.0.0 (or whichever network)
No auto-summary

Question 5

RIPv2 Manual Summarization

Answer 5

From interface config (interface you’re sending the summary route out of):
ip summary-address rip 10.0.0.0 255.255.0.0

Question 6

Command: View RIP configuration

Answer 6

show run | section rip

Question 7

Command: Check RIP Database

Answer 7

show ip rip database

If you have RIP neighbors & don’t see expected routes, check this

Question 8

Command: RIP Default Route Injection

Answer 8

ip route 0.0.0.0 0.0.0.0 203.0.113.2
router rip
default-information originate

(Injects the above default route into RIP)

Question 9

Command: RIP Passive Interface on FastEthernet3/0 on the 203.0.113.0 network

Answer 9

router rip
passive-interface f3/0
network 203.0.113.0

Question 10

EIGRP Characteristics

Answer 10

Advanced Distance Vector IGP
Supports large networks
Fast convergence time
Supports bounded updates (network topology changes only sent to affected routers)
Messages sent via Multicast
Automatic equal cost load balancing (up to 4 paths by default, can be increased to 16)
Supports unequal cost load balancing

Question 11

EIGRP Configuration (10.0.0.0/16 network)

Answer 11

router eigrp 100
network 10.0.0.0 0.0.255.255

(Uses wildcard mask; 100 = AS number)

Question 12

EIGRP Verification Commands

Answer 12

show run | section eigrp
show ip eigrp interfaces
show ip eigrp neighbors

Question 13

EIGRP: Router ID

Answer 13

Used by EIGRP routers to identify themselves
Takes form of an IP address

Defaults to being the highest IP of any loopback interfaces configured, or the highest other IP address if a loopback doesn’t exist

Can be manually specified

Question 14

Command: EIGRP Router ID Configuration for 2.2.2.2

Answer 14

router eigrp 100

eigrp router-id 2.2.2.2

Question 15

Command: View EIGRP Router ID

Answer 15

show ip protocols

show ip int brief
(And find the highest IP of interfaces; if you have a loopback, that will be the Router ID even if it’s lower)