October 19, 2013
The second item under the topics in the new ICND2 200-101 exam, requires that you can identify PVSTP.
PVSTP or Per VLAN Spanning Tree Protocol does just that, each VLAN will have a different STP setup or topology, as it is done on per VLAN basis.
As the engineer this provides you with a great tool to load balance traffic over the network, using some configuration options you can decide what switches will become root.
Note: All of the interfaces on the Root switch will be DP’s
The above example show you how the two VLANs have a different topology.
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ICND2 Topics, Networking, Protocols, Switches, VLANs | Tagged: 2001-101, ccna exam, cicsco, cisco switches, cisco swittching, icnd2, per vlan spanning tree protocol, PVSTP, switches, topology, vlan | 
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Posted by Josh Gahan
August 26, 2013
- VTP server mode
- No VTP domain name
- VLAN 1 and VLAN’s 1002-1005 are automatically configured (cannot be deleted)
- All access interfaces are assigned to VLAN 1 (an implied switchport access vlan 1 command)
Leave a Comment » | IOS Commands, Networking, Protocols, Switches, VLANs, VTP | Tagged: 4094 vlans, access port, ccna defaults, ccna exam, ccna study, cisco defaults, cisco ios, default vlan, icnd2, iOS, sccess switch, switches, trunking, virtual lan, vlan, vlan 1002, vlan 1003, vlan 1004, vlan 1005, VLAN Trunking Protocol, vlan1, vlans, vtp domain name, vtp server mode | Permalink
Posted by Josh Gahan
August 26, 2013
Step 1
a. From configuration mode, use the vlan vlan-id global configuration
command to create the VLAN and to move the user into VLAN
configuration mode.
b. (Optional) Use the name name VLAN subcommand to list a name
for the VLAN. If not configured, the VLAN name is VLANZZZZ,
where ZZZZ is the 4-digit decimal VLAN ID.
Step 2 To configure a VLAN for each access interface, follow these steps:
a. Use the interface command to move into interface configuration
mode for each desired interface.
b. Use the switchport access vlan id-number interface subcommand to
specify the VLAN number associated with that interface.
c. (Optional) To disable trunking on that same interface, ensuring that
the interface is an access interface, use the switchport mode access
interface subcommand.
Leave a Comment » | IOS Commands, Networking, Protocols, Switches, VLANs | Tagged: ccna, ccna exam, cisco vlan, icnd2, ios commands, switch vlan, vlan, vlan id, VLAN name, vlan step by step, vlans | Permalink
Posted by Josh Gahan
August 25, 2013
By default a cisco switch flood broadcasts (and unknown destination unicast frames) in each active VLAN out all trunks, as long as the current STP topology does not block the trunk. In most campus networks, many VLANS exist only on a few switches. Therefore it’s wasteful to forward broadcasts over all trunks, causing frames to arrive at switches that do not have any ports in that VLAN.
Switches support two methods by which an engineer can limit which VLAN’s traffic flows over a trunk.
- Manual method using the allowed VLAN list
- VTP Pruning
VTP pruning allows VTP to dynamically determine which switches do not need frames from certain VLANS and then VTP Prunes those VLANs.
Pruning Simply means that the appropriate switch trunk interfaces do not flood frames in that VLAN.
Leave a Comment » | Networking, Protocols, Switches, VLANs, VTP | Tagged: ccna exam, cisco, icnd2, lan, pruning, virtual lan, vlan, Vlan list, VLAN Trunking Protocol, Vlan.dat, VTP Pruning | Permalink
Posted by Josh Gahan
August 25, 2013
To forward traffic for a VLAN, a switch needs to know the VLAN’s ID and it’s name and that’s the job of VTP.
The VLAN database itself is actually stored in flash as VLAN.dat
Leave a Comment » | Networking, Switches, VLANs | Tagged: ccna, ccna exam, cisco switches, icnd2, networking, protocol, switch, vlan, VLAN Trunking Protocol, vlans, VTP | Permalink
Posted by Josh Gahan
August 24, 2013
Synchronisation occurs when all switches learn of a new VLAN configuration and they all learn the same VLAN ID and name.
Leave a Comment » | Networking, Protocols, Switches, VLANs, VTP | Tagged: ccent, ccna, ccna exam, icnd2, server mode, synchronisation, transparent mode, vlan, VLAN domain name, vlan id, VLAN name, VLAN Trunking Protocol, VTP server | Permalink
Posted by Josh Gahan
August 15, 2013
- Create designs that allow you to group users more easily by either those working together or department
- Allows you to segment the LAN which has the positive affect of reducing the overhead on each LAN segment
- Provide Spanning Tree Protocol (STP) with less work to do by limiting a VLAN to an access switch
- By keeping hosts that work together on a single VLAN, you are able to enforce stronger security by keeping the data on a individual VLAN
- Seperate CISCO IP Phone traffic from the PC traffic
You could simplify this further:
- Security
- Performance
- Design
Leave a Comment » | Networking, VLANs | Tagged: broadcast, broadcast domains, broadcasts, ccna, ccna exams, design, icnd2, lan, network design, performance, security, stp, switches, vlan, vlans, Voip | Permalink
Posted by Josh Gahan