Router#show ip eigrp topology Router#show ip eigrp topology IP-EIGRP Topology Table for AS 100/ID(192.168.1.1) Codes: P – Passive, A – Active, U – Update, Q – Query, R – Reply, r – Reply status P 10.1.1.0/24, 1 successors, FD is 28160 via Connected, FastEthernet0/0 P 10.2.2.0/24, 1 successors, FD is 20514560 via 192.168.1.2 (20514560/28160), Serial1/0 […]
Category: Archive
ICND2 – Abbreviations
802.3 Ethernet AAA Authentication Authorization Accounting ABR Area Border Router ACL Access Control List AD Advertised Distance AD Administrative Distance AF Assured Forwarding API Application Programming Interface APIC Cisco Application Policy Infrastructure Controller APIC-EM Application Policy Infrastructure Controller – Enterprise Module ARP Address Resolution Protocol AS Autonomous System ASBR Autonomouse System Boundary Router ASN Autonomous […]
Administrative Distances
0 connected interface 1 Static route 20 External BGP 90 Internal EIGRP 100 IGRP 110 OSPF 115 IS-IS 120 Routing Information Protocol (RIP) 140 Exterior Gateway Protocol (EGP) 170 External EIGRP 200 Internal BGP 255 Unknown and unused
Syslog
An overview of the Syslog levels: 0 emergencies System is unusable (severity=0) 1 alerts Immediate action needed (severity=1) 2 critical Critical conditions (severity=2) 3 errors Error conditions (severity=3) 4 warnings Warning conditions (severity=4) 5 notifications Normal but significant conditions (severity=5) 6 informational Informational messages (severity=6) 7 debugging Debugging messages (severity=7)
Router On A Stick
Want to know how to configure Router On A Stick?Here is an example. This setup is created with Cisco Packet Tracer. The PC’s are configured with routers of type 2811.After configuring this setup, the PC’s can ping each other. You can download:Cisco Packet Tracer fileVisio file
Cisco 2811 – Modules
A Cisco 2811 can have modules inserted. Here is a list of some of those modules: NM-1ENW-1E2WNM-1FE-FXNM-1FE-TXNW-1FE2WNM-2E2WNM-2FE2WNM-2WNM-4A/SNM-4ENM-8A/SNM-8AMNM-ESW-161HWIC-1GE-SFPHWIC-2THWIC-4ESWHWIC-8AHWIC-AP-AG-BWIC-1AMWIC-1ENETWIC-1TWIC-2AMWIC-2T I was curious how those modules had effect on the running config concerning the interfaces. So in Packet Tracer, I took a moment to make an inventory of all those modules, with the interfaces section of the running […]
Security
A basic configuration to add users and console/ssh access. Add a username with secret and privilege: 2960a(config)#username philip secret cisco-philip 2960a(config)#username philip privilege 15 Add console access: 2960a(config)#line console 0 2960a(config-line)#password cisco-console 2960a(config-line)#login Add SSH access: 2960a(config)#ip domain-name testenv.lan 2960a(config)#crypto key generate rsa How many bits in the modulus [512]: 2048 2960a(config)#ip ssh version 2 […]
Access List
Small example created with Cisco Packet Tracer 7.2. Partial script concerning “access-list”: [Config…] ! hostname LabA ! [Config…] ! interface FastEthernet0/0 description Uplink HomeRouter ip address 10.0.0.2 255.255.255.0 duplex auto speed auto ! interface FastEthernet0/1 description Sales ip address 172.16.40.1 255.255.255.0 duplex auto speed auto ! interface FastEthernet1/0 description Finance ip address 172.16.50.1 255.255.255.0 ip […]
Straight-Through Cable vs Crossover Cable
When to use a “Straight-Through Cable” and when a “Crossover Cable”, the CCNA way.
Router – Router – access list
In this small example, two Cisco 2811 routers are connected, both on FastEthernet0/0, explaining the use of access-list. The partial config of router0: interface FastEthernet0/0 ip address 10.0.0.1 255.255.255.0 The partial config of router1: interface FastEthernet0/0 ip address 10.0.0.2 255.255.255.0 ! [config…] ! access-list 10 deny host 10.0.0.1 Make note that the command access-list 10 […]