I noticed that not everybody knows how to download Cisco certs PDF files or order additional printed copies. Just open this link, login with your Cisco credentials and enter the menu "Certification Fulfillment". An additional CCIE plaque costs 150USD, paper certs cost 15USD. HTH

NTP client / server with authentication SERVER CONFIG ntp authentication-key 1 md5 0802657D2A36 7 ntp master 5 CLIENT CONFIG ntp authentication-key 1 md5 1531223F2705 7 ntp authenticate ntp trusted-key 1 ntp server 10.0.12.1 key 1 Notes: the client authenticates the time source, server must have the key.

The dscp mutation map is a per-port configuration that permits to modify the dscp field of a packet. The mutation map works for EGRESS traffic only We trust the documentation but it's event better to verify it. The topology si simple: PC1 11.0.0.1 --> G1/0/1 C3750-24 G1/0/24 --> G1/0/24 C3750-48 G1/0/1 --> PC2 11.0.0.2 …

Private VLAN configuration: vlan 300 private-vlan primary private-vlan association 301-302 ! vlan 301 private-vlan isolated ! vlan 302 private-vlan community Port configuration: interface GigabitEthernet1/0/1 switchport private-vlan host-association 300 301 switchport mode private-vlan host What about the SVI? …

Netflow quick notes for basic config. NETFLOW EXPORT Send NetFlow data to a collector: From? (source) Where? (destination, port) How? (udp, sctp, backup) Version? (1,5,9) SAMPLING / FILTERING Not all traffic is evaluated to generate NetFlow statistics. Sampling (one packet each N) of filtering (sampling only on a class …

Your Route to Cisco Career Success by Kevin Wallace A free ebook from Amazon/Kindle about the strategy to prepare for a brilliant career in networking. UPDATE: the book was free just for a limited amount of time (I got the link from Twitter).

This week I'm attending an HP training in Milan. The course topics aren't as challenging as I've expected but I had the opportunity to test focus on some interoperability problems that may occur in mixed environments, especially with Cisco and non-Cisco devices, like PVST. For this post we use 2 switches, a Cisco and a …

Inspired by the Packet Pushers Podcast I setup my personal IPv6 tunnel to TunnelBroker.net. Registration is free and the configuration is straightforward. The first step is the registration and setup of a tunnel to our IPv4 address. Second step the configuration of the tunnel on our side. The webiste includes many …

You can either do a planned, careful migration, or you can do it in a panic, and you should know full well that panicking is more expensive. Martin Levy, director of IPv6 strategy for Hurricane Electric

Remember: voice Vlan is not automatically created when applied to a port. You must create it!

Number 8 is the one I mention when I see a network project made with PowerPoint that looks simple with all those clouds and arrows: (8) It is more complicated than you think. Link to all the 12 truths HERE

Quite often when a network configuration includes authentication or 802.1x on network devices Radius is the protocol of choice. Info NtRadPing is a free utility to test a Radius server. The usage is simple: insert the IP address of the radius server, the secret, user name and password of the user to test. Remember to …

HP allows Cisco certified people to achieve it's MASE/ASE certs using Fast Track: While HP certifications aren't as popular as Cisco's they can be a way to learn a different platform and increase career opportunities. The official cert guide is available on Amazon.

A quick note about tcp small servers. DOC-CD says: The TCP small servers consist of three services: Discard (port 9), Echo (port 7), and Chargen (port 19). If we do a portscan to a router before and after enabling tcp-small-server with the command: R(config)#service tcp-small-servers We can see that these ports are …

Thou shalt above all, maintain the integrity of the network. Thou shalt have a long term strategic direction. Thou shalt always opt for quality before expediency. Thou shalt meet the requirements, exceed the expectations and anticipate the needs of users. Thou shalt benefit from a successful implementation by careful …