Monthly Archives: August 2014

CCIE DC: Two advanced vPC Concepts

*+-Today we are going to chat about some advanced vPC concepts, I have done vPC to death but I want to chat about something that bothers me with vPC and peoples understanding I think of vPC. When you enable a

Posted in CCIE Datacenter

CCIE DC: Definitive Jumbo frames

*+-There are SO many possible iterations, there’s MTU with Nexus 5k MTU with Catalyst Switches MTU with MDS MTU with Nexus 7k MTU on SVI Interfaces MTU on physical interfaces MTU on UCS (Both on the FI itself and the

Posted in CCIE Datacenter

Cisco Secure ACS Shell Profiles and Command sets, How to configure Shell Profiles and Command sets in ACS

*+-Cisco Secure ACS Shell Profiles and Command sets are the key terms related with AAA authorization. Cisco Secure ACSShell profiles and Command Sets are combined for user authorization at shell and also to authorize commands ate different privilege levels and

Posted in CCIE Security

CCIE DC: Buffer to Buffer Credits in FC and Dedicated Vs Shared Mode, then finally FCoE Distances

*+-Buffer to Buffer Credits So in FC, Drops are obviously a huge issue, one of the causes of Drops is buffers running out on receive ports, so FC created a concept called Buffer to Buffer Credits, What this does is

Posted in CCIE Datacenter

CCIE DC: Advanced FCIP

*+-In this post I am going to assume you already know the basics of FCIP, and we will spend most of our time talking about the more advanced aspects. We will have fun performing benchmarks etc to show the speed

Posted in CCIE Datacenter

CCIE DC: Advanced Fabric Path and vPC+

*+-Many things scare a newbie CCIE DC candidate, and one of those things that scared me was VPC+, VPC+ and Enhanced VPC?? i said to myself, How could it possibly get any more complicated? Fortunately VPC+ (as well as eVPC

Posted in CCIE Datacenter

CCIE DC: Advanced FCIP

*+-We will have fun performing benchmarks etc to show the speed that FCIP is capable of Below is a screenshot of the roadkil Disk Speed result for our drive connected via standard FC, as you can probably tell it’s not

Posted in CCIE Datacenter

PPP – IPCP Negotiation IP Address Assignment

*+-PPP provides a way to assign ip address to a remote client on a serial link using IPCP protocol. Remember IPCP is part of PPP protocol suite. Assuming you have a very simply 2 routers topology shown below; Question: Configure the

Posted in CCIE R&S

PPP – The mystery of “ppp ipcp mask request” command

*+-If you ever used IPCP for address allocation with PPP (“ip address negotiated” on client side and “peer default ip address” on server side) you may have noticed that the mask assigned to a client is always /32. It does

Posted in CCIE R&S

PPP – PPP Authentication CHAP

*+-PPP Labs PPP supports three type of Authentication, PAP CHAP EAP CHAP Challenge Handshake Authentication Protocol: It is 3 way handshake Username is clear test and password is MD5 hash Server send Challenge Client sends username and MD5(Password) Server  response

Posted in CCIE R&S