Thursday, August 15, 2013

Data Center Study - Notes 01

- reverse proxy caching
- the user of loadbalancers for server health monitoring
- the need for jumbo frames
- the need for NIC features such as interrupt coalescing

Wednesday, August 7, 2013

Study Notes [8 Aug, 2013]

- Nexus 1000V Seminars

- 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
    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) >>

- How OpenFlow Changes Networking >>
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.

Wednesday, June 26, 2013

Lecture Notes for Day1 Switching Lab

Layer 4 - segments - Ports TCP/UDP
Layer 3 - packets - IP Address v4 32 bits - Router/Switch
Layer 2 - frames - MAC Address 48bits - Switch
Layer 1 - bits / bytes - Hub

default VLAN

#show flash:vlan.dat

- 1-4094

- Normal VLAN Range (2-1001) >> can create in which VTP mode ? >> vtp server / transparnet mode
- Extended VLAN Range (1006-4094) >> can create in which VTP mode ? >> vtp transparent mode

- what is VTP ? ( show vtp status )
- VTP Mode ( Server, Client, Transparent )
- vTP Client Mode >> Cannot create VLAN, delete VLAN

- IOS ( lanbase, ipbase, ipservices )

- startup config vs running config

POST: CPU Buffer Tests : Begin
POST: CPU Buffer Tests : End, Status Passed
POST: CPU Interface Tests : Begin
POST: CPU Interface Tests : End, Status Passed
POST: Switch Core Tests : Begin
POST: Switch Core Tests : End, Status Passed
POST: CPU Interface 2nd Stage Tests : Begin
POST: CPU Interface 2nd Stage Tests : End, Status Passed
POST: CAM Subsystem Tests : Begin
POST: CAM Subsystem Tests : End, Status Passed
POST: Ethernet Controller Tests : Begin
POST: Ethernet Controller Tests : End, Status Passed
POST: Loopback Tests : Begin
POST: Loopback Tests : End, Status Passed

- Blocking ( 20 secs ) , Listening ( 15 secs ), Learning ( 15 secs )

- how switch learns MAC address

- show mac address table vs show ip arp/show
- layer 2 broadcast (ff:ff:ff:ff:ff:ff)
- layer 3 broadcast (

Switch#show arp
Protocol  Address          Age (min)  Hardware Addr   Type   Interface
Internet                0   10dd.b1c8.3a21  ARPA   Vlan1
Internet                2   2cd4.44b7.6c6a  ARPA   Vlan1
Internet              -   000d.bc91.7f80  ARPA   Vlan1

- Creation of Interface VLAN ( so called SVI- Switched Virutal Interface )
- Why interface VLAN ?

Switch#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
Switch(config)#ip routing

Switch#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

C is directly connected, Vlan1 is subnetted, 1 subnets
C is directly connected, Vlan20

- set all the PCs with IP Addresses and point to their respective gateway
- do the ping test from each pc and analyze the result
- configure "no ip routing" , the ping will fail
- that proves the difference between Layer 2 Switch and Layer 3 switch

show run
show ver
show vtp status
show vtp password
show etherchannel summary
show int trunk
show spanning-tree
show ip route
show vlan brief

Wednesday, April 3, 2013

HA with Two DMVPNs Lab

Since I need to deploy DMVPN for one of my customers, I'm going to draw and test as usual.
It took me 3Apr2013 20:30hrs - 4Apr2013 02:30hrs. 
First Problem I faced is IPSec Tunnel didn't up.
Second Problem is wrong NHS IP Address for DMVPN Cloud2, so EIGRP Neighbors for Tunnel 2 didn't up from Spokes. My silly typing errors of NHS IP Address of DMVPN Cloud2. 
Redundancy Tested Successfully. Finally, i made it. I can sleep happily now.

Wednesday, March 27, 2013

RHC Technologies

I created a facebook page called "RHC Technologies" to be more interactive.  As usual, I love drawings and I post as "Picture Articles". Please help to visit to RHC Technologies Page.

Monday, February 25, 2013