Certification plans

CCNP 2/3 BCMSN Exam planned for : Dec 16th

While waiting for the new TSHOOT exam to be released
CCNA Security Exam planned for : 1st of February

Save VLAN.DAT in GNS/Dynamips

You know when you boot your router, the flash: is not saved and the vlan.dat that is saved on it is lost.. To remedy this, use a vlan.dat saved in nvram:

SW0(config)# vtp file nvram:/vlan.dat
SW0#dir nvram:
Directory of nvram:/

  123  -rw-        1683                      startup-config
  124  ----           5                      private-config
    1  -rw-           0                      ifIndex-table
    2  -rw-         780                      vlan.dat

There, now all your vlan/vtp config will be saved..

Etherchannel

Pagp explained and silent/non-silent modes:

Fiber Optic connectors

ST (Straight Tip)


SC (Subscriber Connector)


LC (Lucent Connector)


MT-RJ (Mechanical Transfer Registered Jack)

Reference:
Timbercon Fiber Optic Connectors
The Fiber Optic Association - Tech Topics

VLANs #1

VLANs are seperate broadcast domains.

VLAN Numbers are 1-1005 (1 and 1002-1005 are reserved)
Extended VLANs are 0-4095. (0,1 and 4095 are reserved)

ISL Trunking
Cisco proprietary protocol. Encapsulates the whole Ethernet frame.
Adding a 26 byte header and 4 byte trailer. (Total of 30 bytes)

802.1Q Trunking
Standards based. Adds a tagging field to the Ethernet Frame.
This is 4 bytes of overhead. With 2 bytes of TPID (Tag Protocol Identifier, alwasys 0x8100), 3 bits of Priority field for CoS (Class of Service), 1 bit CFI, and 12 bits of VLAN Identifier.

Has concept of Native VLan. Frames that belong to native vlan are not encapsulated with any tagging information.

Because default Ethernet frames are 1518 bytes (1500 bytes of MTU and 18 bytes Ethernet header), with the addition of 802.1Q, Ethernet frame size is increased to 1522 bytes.

Kendi CCIE Lab'ini yaratmak

4 gerçek switch, 10+ NIC, dynamips ve vmware kullanarak tüm lab ihtiyaçlarını karşılamak mümkün. Örnek:

@7200
HOWTO Connect Real Switches Using One NIC & QinQ

IPv6 in XP and v6 tunneling

@ipv6int.net

DDoS attacks history and timeline

I was a sophomore in Iowa when all this started.

Dittrich Timeline

The Cyber Crime Hall of Fame

EIGRP Load Balancing

Equal load balancing & Unequal load balancing

@IExpert

Passed the BSCI

Alright, on to the next.. BCMSN and then when the new courses become available, TSHOOT.

OSPF NSSA Tricks

Check:
@Cisco: OSPF Not-So-Stubby Area (NSSA)

EIGRP Study Notes

Features:
Advanced Distance Vector routing protocol.
DUAL Algorithm
Neighbor relations
Sends only incremantal updates
Unequal-Cost Load Sharing

Packet Types:
Hello
Update
Query
Reply
Ack

Neighborship Requirements:
Receive Hello from neighbor
AS Number must match
K values must match

Simplified Metric

            10^7            total delay
256 * ( ------------   +      in tens     ) 
        Min.BW(Kbit)      of microseconds

3 Tables
Neighbor
Topology
Routing

Feasibility condition :
For a route to be considered feasible successor, the FD > AD.

Commands
ip hello-interval eigrp as-number seconds
ip hold-time eigrp autonomous-system-number seconds
bandwidth
ip bandwidth-percent eigrp as-number percent
variance
eigrp stub { receive-only | connected | summary | static }
ip summary-address as-number address mask