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How to create VLAN Interfaces for InterVLAN Routing in Cisco IOS

2008-07-01
By: admin
In: Cisco
Tagged: Cisco, cisco-switch, InterVLAn-Routing, ios, router, switch, vlan

VLAN Interfaces are required in network scenarios where you have different VLANs and need Inter-VLAN switching on Layer3 (Routing capable) switches. Every VLAN that needs to be routed should have a VLAN interface. Let’s say we have VLAN 10 which hosts the subnet 192.168.10.0 subnet, VLAN hosts 192.168.20.0 subnet and VLAN 30 hosts 192.168.30.0 subnet. For Inter-VLAN routing to work, we need to have a VLAN interface setup for each of these VLANs and configured with an IP address from the same subnet which will be the default Gateway for that subnet. Lets say, 192.168.10.254,192.168.20.254.192.168.30.254 are the IP addresses for VLAN Interfaces of VLAn 10,20,30Read More →

High CPU usage when SNMP is enabled in Cisco Routers

2008-06-19
By: admin
In: Cisco
Tagged: Cisco, CPU, High, ios, process, router, snmp, switch

Cisco Routers and Switches with L3 routing functions are seen to have problems with High CPU usage when SNMP is enabled. This can range anything from 15% to 40%. According to Cisco, these are low priority processes and other priority processes requiring CPU cycles are given priority over these processes and this level of CPU utilisation can be is normal. However, it is always better to be safe than sorry and get the CPU utilisation caused by SNMP to bare minimum so as to ensure the Routers function smoothly. The reason behind the High CPU usage can be caused by the Network Management Server (SNMPRead More →

Clear Access Control List (ACL) Counters in Cisco IOS

2008-05-07
By: admin
In: Cisco
Tagged: acl, Cisco, Counters, ios, router

When troubleshooting a problem with Access Control lists, one of the things you would want to do is to clear the counters on the ACL matches. In Cisco IOS, you can clear the ACL Matches counters as follows:Read More →

Logging Synchronous while working in Cisco Router/Switch Console

2008-04-25
By: admin
In: Cisco
Tagged: Cisco, ios, logging, router, switch, Synchronous

Another beginner tip that can be useful! When you work on the Cisco Router or Catalyst Switch console, it would be annoying to have the console or terminal (telnet/ssh) logs to pop in between your commands. This can be even more irritating when it is busy switch or a router spitting messages continuously.Read More →

Configure Named Acces Control Lists (ACL) in Cisco Routers

2008-04-18
By: admin
In: Cisco
Tagged: acl, Cisco, Extended-ACL, ios, router, Standard-ACL

With Cisco IOS version 11.2, Cisco introduced the Named ACLs. Named ACLs are Standard or Extended ACLs which are give names instead of a ACL number. Technically, other than giving a name to the ACL there isn't any other difference when it comes to the functionality as in Standard or Extended ACL.Read More →

Configure Extended Access Control Lists(ACL) in Cisco Routers

2008-04-18
By: admin
In: Cisco
Tagged: acl, Cisco, Extended-ACL, icmp, ios, ip, router, Standard-ACL, tcp, udp

Extended ACLs are advanced than the Standard ACLs. Unlike the Standard Access Lists where it checks only the Source IP Address to control the flow of the packets, Extended ACLs can check the Source & Destination Address Protocols (IP,ICMP,TCP,UDP) Source & Destination portsRead More →

How to configure Cisco Router as Authoritative DNS Server

2008-04-16
By: admin
In: Cisco, DNS
Tagged: caching, Cisco, DNS, dns-server, domain, forwarding, ios, router

While we saw here how to setup a Cisco Router as a Caching/Forwarding DNS Server. We can now look at how to make your Cisco Router as an Authoritative DNS server. When configured as an authoritative name server for its own local host table, the router listens on port 53 for DNS queries and then answers DNS queries using the permanent and cached entries in its own host table. Careful consideration has to be given as this can consume considerable amount of resources like CPU cycles on the Cisco Router. If you are a small network and realise your Cisco ROuter is under utilised thenRead More →

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