Study Notes [8 Aug, 2013]

- Nexus 1000V Seminars
- www.cisco.com/go/1000vseminar

- VSM & VEM Connectivity
    +Layer 2 Connectivity of the VSM and VEM
        +Two virtual interfaces are used to communicate between VSM and VEM : Control Interface & Packet Interface
       
    +Layer 3 Connectivity of the VSM and VEM (used only when VSM and VEM are in different subnets)
        +svs-domain "svs mode L3 interface (control0 | mgmt0)
       
- Nexus 1000v Interfaces (All 3 interfaces can share the same VLAN, so can share the same port-profile
    +Control
    +Management
    +Packet
   
    Nexus1000(config)#port-profile type ethernet VSM
    Nexus1000(config-port-prof)#switchport mode access
    Nexus1000(config-port-prof)#switchport access vlan 10
    Nexus1000(config-port-prof)#system vlan 10
   
- Open V switch (Opensource) >> http://www.youtube.com/watch?v=_PCRNUB7oNw

- How OpenFlow Changes Networking >> http://www.youtube.com/watch?v=oFek19ZYpPs
Network. Back 20 years ago, email was primary application on it. And then web, along with that ecommerce $$, and Voice & Video
came shorty there after. Now about social networking. Now more recently, everyone wanna be mobile. So every applications gotta be mobile.

Cisco Gigabit Ethernet GBIC/SFP Modules

Another Best Practice for Security Engineers ...

Subscribe mailing list as below for just another best practice for security engineers ...

 

Types of Memory in a Router

1- RAM

• DRAM ;
• used by CPU to execute IOS and hold running-config, routing tables, and ARP cache ;
• information in RAM is cleared when the router is reloaded ; 

2- ROM

• referred to as EPROM ;
• contains POST diagnostics and the bootstrap or boot-loader software ;
• allows the router to boot from ROM Monitor mode when it cannot find a valid IOS image ;

 3- Flash

• available as EPROMs, SIMMs, or PCMCIA cards ;
• default location where a router finds and boots its IOS image ;
• contents of Flash are retained when the router is reloaded ;

4- NVRAM

• stores startup-config ;
• contains the software configuration register, a configurable setting in IOS that determines which image to use when booting the router ;
• contents of NVRAM are retained when the router is reloaded ; 

 

Configuring Cisco Access Server

I'm exploring to setup Cisco Access Server.

 

 

 

 

Reference : Choosing An Access Server - Part I

                   Choosing An Access Server - Part II

Step 1 - Create a loopback interface and assign an IP Address.

!

int lo0

    ip add 192.168.10.1 255.255.255.0

!

Step 2 - Allow Telnet as a transport across asynchronous lines 1 to 16.

!

line 1 16

   exec-timeout 0 0

   no exec

   transport input telnet

!

Step 3 - Creating a host table that maps a Router's Host Name to the Asynchronous Line to which it is connected to the terminal server

!

ip host R1 2001 192.168.10.1

ip host R2 2002 192.168.10.1

ip host R3 2003 192.168.10.1

ip host R4 2004 192.168.10.1

ip host R5 2005 192.168.10.1

ip host Cat1 2006 192.168.10.1

ip host Cat2 2007 192.168.10.1

ip host Cat3 2008 192.168.10.1

ip host Cat4 2009 192.168.10.1

!

Step 4 - Verification Commands

# show sessions   - Displays all open sessions

# clear line line # - Clear the desired asynchronous line(1 to 16, where 1 = 2001, 2 = 2002 and so on)

# Ctrl-Shift-6, x   - Escapes the current session and returns to the terminal server

# disconnect connection # - Disconnects the desired the connection

BGP versus OSPF/ISIS

This is good enough for your interview. But the below slides will be more easy to understand if you had working experience in IXP Environment before.




Reference : Cisco Systems, Inc.
~~

A GREAT habit

A GREAT habit to get into is to know exactly what you are looking to see in the output of a command BEFORE you run that command. This will solidify your knowledge of the protocols as well as give you more confidence.

Reference : IP Expert CCIE-RS BLS

Using Loopback Interfaces

Source : Network Security Principles and Practices (Cisco Press)

deny ip any any log

access-list 100 deny ip any any log

TIP : ending with a "deny ip any any log" will allow you to see what traffic is being dropped.

Study Update (Oct 2010)

Weight vs Local-preference

This is my note after studying Narbik's Lab.

July, Aug and Sept 2010

After interpreting my study calendar :
- September 2010 is Unproductive Month;
- Study Method is not systematic;

My BGP RR Note

I love drawing Network Diagrams. Below two diagrams are my BGP RR Note after studying Narbik's CCIE RS WB 2.0. The 15-pages of Narbik RR Lab was consolidated to two diagrams. I'm happy with the result. ;)
Enjoy Studying !!!

Note : OSPF graceful shutdown with the Stub Router Advertisement feature

- http://packetlife.net/blog/2008/oct/29/ospf-stub-router-advertisement/
- http://www.nil.com/ipcorner/OSPFGracefulShutdown/

Note : Q-in-Q Tunneling

- http://blog.stupidpacket.com/wp/?p=3
- http://irwanp.wordpress.com/2008/06/23/qinq-8021q-tunneling-on-cisco-switches/
- http://irwanp.wordpress.com/2008/07/14/connecting-trunk-with-qinq/

Note : VLANs range 1006 - 4094

Extended-range VLANs range from 1006-4094, inclusive. However, these additional VLANs cannot be configured in VLAN database mode, nor stored in the vlan.dat file, nor advertised via VTP. In fact, to configure them, the switch must be in VTP transparent mode.

Note : Route-map

A route-map is a filtering mechanism that has an "implicit deny" for all networks that are not matched in any route-map statement. If a route-map is not intended to filter routes, then you should add another route-map statement at the end to permit all remaining networks without changing it (no match and no set commands are used within that route-map statement).