Cisco Router and Switch Configuration: PPP, DHCP, VLAN, RIP, OSPF, EIGRP

Classified in Technology

Written at November 18, 2024 on English with a size of 4.33 KB.

Cisco Router and Switch Configuration

PPP Authentication

1. User Configuration (Matching Passwords on Both Routers)

router(config)# username <hostname_remote_router> password <password>

2. Interface Encapsulation Change

router(config-if)# encapsulation ppp

3.1 Enabling PAP Authentication

router(config-if)# encapsulation ppp router(config-if)# ppp authentication pap router(config-if)# ppp pap sent-username <local_username> password <password>

3.2 Enabling CHAP Authentication

router(config-if)# encapsulation ppp router(config-if)# ppp authentication chap

DHCP Scope Configuration

router(config)# ip dhcp pool <POOL_NAME> router(config-dhcp)# network <NETWORK_ADDRESS> <NETMASK> router(config-dhcp)# default-router <GATEWAY_IP> router(config-dhcp)# dns-server <DNS_SERVER_IP> router(config-dhcp)# netbios-name-server <WINS_SERVER_IP> router(config-dhcp)# domain-name <DOMAIN_NAME>

Address Exclusion

router(config)# ip dhcp excluded-address <START_IP> <END_IP>

VLAN Interface Association

Assigning Interfaces to VLANs

switch(config)# interface type x/y switch(config-if)# switchport mode access switch(config-if)# switchport access vlan <VLAN_ID>

Assigning a Range of Interfaces to a VLAN

switch(config)# interface range type x/y - z (where x=Start Interface, y=End Interface) switch(config-if-range)# switchport mode access switch(config-if-range)# switchport access vlan <VLAN_ID>

Example

switch(config)# interface range fastEthernet 0/1 - 10 switch(config-if-range)# switchport mode access switch(config-if-range)# switchport access vlan 10

Trunk Configuration

Trunk on a Switch

switch(config-if)# switchport mode trunk

Trunk on a Router

router(config)# interface fastethernet 0/0 router(config-if)# no shutdown router(config-if)# interface fastEthernet 0/0.1 router(config-subif)# encapsulation dot1q <vlan_number> router(config-subif)# ip address ...

RIP Configuration

router(config)# interface fastethernet 0/0 router(config-if)# ip address 192.168.50.129 255.255.255.192 router(config-if)# ip rip send version 1 router(config-if)# ip rip receive version 1 router(config)# interface fastethernet 0/1 router(config-if)# ip address 172.25.150.193 255.255.255.240 router(config-if)# ip rip send version 1 2

RIP Verification Commands

show ip protocols show interface <interface> show ip interface <interface> show running-config show ip rip database

OSPF Configuration

router(config)# router ospf <process-id> router(config-router)# network <address> <wildcard-mask> area <area-id> router(config)# interface loopback 0 router(config-if)# ip address 192.168.3.33 255.255.255.255 router(config-if)# bandwidth 64 router(config-if)# ip ospf cost 1562

OSPF Authentication

Without MD5

router(config-if)# ip ospf authentication-key <password> router(config-router)# area <area-number> authentication

With MD5

router(config-if)# ip ospf message-digest-key <key-id> md5 <key> router(config-router)# area <area-id> authentication message-digest

Other OSPF Configurations

router(config-if)# ip ospf hello-interval <seconds> router(config-if)# ip ospf dead-interval <seconds> debug ip ospf events --Increase priority to elect a DR router switch(config)# interface fastethernet 0/0 switch(config-if)# ip ospf priority 50

EIGRP Configuration

router(config)# router eigrp <as-id> router(config-router)# network 192.168.3.0 router# show ip eigrp topology

EIGRP Additional Commands

eigrp log-neighbor-changes Summarize routes: router(config-router)# no auto-summary