Category: Network

Archiving and restoring Cisco configuration

Have you ever been in a situation that, you typed many commands on your Cisco device and after that you came to conclusion that your new configuration does not work as you expected? Continue Reading

EIGRP and OSPF advertised routes

Today I was examining what happens if a router learned a route via EIGRP which is also known via static route entry. Continue Reading

Routing table investigation: longer-prefixes keyword

When router makes decision which route use to forward a packet then the route with the longest match is used. “Longest match” means the route with the longest mask. Continue Reading


This post shows how to configure VACLs (Vlan access lists).
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LACP configuration

This post shows example how to configure LACP and verify that it works properly. Link Aggregation Control Protocol (LACP) is open standard protocol for aggregating links into one virtual channel (in comparision to PAgP which is similar but Cisco proprietary protocol).
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Tips about configuring Ethernet port on Cisco switch

At first glance there is nothing special about configuring Ethernet port on Cisco switch. Continue Reading

Troubleshoot VLANs and Trunks

This post lists the commands useful for troubleshooting VLAN and Trunk ports on Cisco switch. Continue Reading

Troubleshoot Ethernet port

Many times when a single user reports problem with his network connection you start troubleshooting from checking the state of Ethernet port on the switch. Continue Reading

Hairpin Connectivity and NAT considerations

By default Cisco ASA will not forward the packets back out the same interface upon which they arrived. Continue Reading

AnyConnect VPN – Split Tunneling

By default all traffic originated from Cisco AnyConnect client is forwarded to Cisco ASA. Continue Reading