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what is vlan pruning

by Alvera Crooks Published 3 years ago Updated 3 years ago

vtp pruning is a dynamic mechanism ,when the downsream routers do not need the vlan traffic ,it will send pruning message . vtp trunk allow is a static mechanism ,it allows the specific vlans pass through the trunk . The two have the same result ,that is reduce the unnecessary traffic through the trunk .

What is VLAN pruning in Cisco switch?

VLAN Trunking Protocol (VTP) pruning is a feature in Cisco switches, which stops VLAN update information traffic from being sent down trunk links if the updates are not needed. If the VLAN traffic is needed later, VLAN Trunking Protocol (VTP) will dynamically add the VLAN back to the trunk link.

Which VLANs are eligible for pruning in visual VTP?

VTP pruning helps improve proper allocation and use of network bandwidth by reducing unnecessary flooded traffic, such as broadcast, multicast, unknown, and flooded unicast packets. Additionally, which VLAN range is eligible for pruning? By default, VLANs 2–1001 are pruning eligible, but VLAN 1 can't be pruned because it's an administrative VLAN .

What is the difference between pruning and clearing of VLAN BPDU?

Go to Solution. 12-27-2005 06:44 AM 12-27-2005 06:44 AM Pruning is a all together different concept then clearing of vlans. When you Prune the vlan BPDU still passes the link but if you clear the vlans BPDU will also stop passing the link.

What is a VLAN trunk?

VLAN Trunk Explained with Examples What is a VLAN Trunk? You can’t describe VLANs without mentioning trunks. It’s a known fact that you can control and segment network broadcasts with VLANs. VLAN trunking enables the movement of traffic to different parts of the network configured as a VLAN.

What is VLAN pruning and why is it a good practice?

VLAN Trunking Protocol (VTP) pruning is a feature in Cisco switches, which stops VLAN update information traffic from being sent down trunk links if the updates are not needed. If the VLAN traffic is needed later, VLAN Trunking Protocol (VTP) will dynamically add the VLAN back to the trunk link.

What does pruning mean in networking?

Pruning is the process of deleting irrelevant parts of a belief network before invoking inference. Consider the network in Figure 9(a) for an example, where is an evidence variable and is a query variable. One can prune node from the network, leading to the network in Figure 9(b).

What is VTP pruning mode?

VTP Pruning is about forwarding *** traffic over a trunk link only if the switch on the receiving end of the trunk link has ports in the source VLAN. This reduces the volume of flooded traffic. Manual Pruning is specifying which VLANs are allowed on the trunk.

Why VTP pruning is used?

VTP Pruning This method leads to wasted network bandwidth. VTP pruning optimizes the usage of network bandwidth by restricting the flooded traffic to only those trunk ports that can reach all the active network devices.

What does being pruned mean?

1 : to cut off dead or unwanted parts of a bush or tree. 2 : to cut out useless or unwanted parts (as unnecessary words in something written) prune.

How do you trim a VLAN from a trunk?

You can remove VLANs from the list of eligible VLANs using these commands. After a VLAN has been removed from the eligible list, it cannot be pruned by VTP. To add the VLANs back, use the command set vtp pruneeligible vlanlist for COS switches or switchport trunk pruning vlan add vlanlist for IOS.

How do I know if VTP is pruning?

– Verify that VTP Pruning is functioning properly by viewing the pruning list on SW1. As shown above from the SW3 show interface trunk output you can see that on port Fa1/13 the VLAN's that are forwarding and not pruned on that trunk link are VLAN's 1 and 10.

How do I enable pruning?

Note: VTP Pruning is disabled by default on all Cisco Catalyst switches and can be enabled by issuing the "set vtp pruning enable" command. If this command is issued on the VTP Server(s) of your network, then pruning is enabled for the entire management domain.

What is VLAN trunking in networking?

VLAN Trunking Protocol (VTP) is a Cisco proprietary protocol that propagates the definition of Virtual Local Area Networks (VLAN) on the whole local area network. To do this, VTP carries VLAN information to all the switches in a VTP domain. VTP advertisements can be sent over 802.1Q, and ISL trunks.

Where is VTP pruning configured?

VTP Pruning configuration : A port on Switch 1 and port on Switch 4 are assigned to VLAN 2. When a broadcast is sent from PC 1 connected to Switch 1.

What is a native VLAN?

A native VLAN is a special VLAN whose traffic traverses on the 802.1Q trunk without any VLAN tag. A native VLAN is defined in 802.1Q (it supports untagged traffic while inter-switch link doesn't support untagged traffic.)

What is VTP revision number?

The configuration revision number is a 32-bit number that indicates the level of revision for a VTP packet. This configuration number is tracked by every switch in order to find that the received information is more recent than the current version.

What is VTP pruning?

VTP pruning helps improve proper allocation and use of network bandwidth by reducing unnecessary flooded traffic, such as broadcast , multicast, unknown, and flooded unicast packets. VTP pruning is disabled by default in Cisco switches. VTP pruning helps to send broadcasts only to those trunk links that actually needs the information.

How to enable VTP pruning on Cisco switch?

To enable VTP pruning on a Cisco IOS switch, you use the vtp pruning VLAN configuration command. Once VTP pruning is enabled, you can optionally configure a prune eligible list if you want to limit the VLANs that can be pruned. The Example below demonstrates how to enable VTP pruning on Switch.

Does VTP pruning work on VLAN 7?

For example, if switch A does not have a port configured for VLAN 7, and broadcast is sent throughout VLAN 7, that broadcast or traffic will not pass through the trunk link to switch A. VTP pruning should only be enabled on VTP servers, all the clients in the VTP domain will automatically enable VT P pruning.

Why can't VLAN 1 be pruned?

VLAN 1 can’t be pruned because it’s an administrative VLAN. All the version of VTP i.e. VTP version 1, VTP version 2 and VTP version 3 support VTP pruning. To enable VTP pruning on a Cisco IOS switch, use the VTP VLAN pruning configuration command.

Does SW3 forward to VLAN 10?

SW3 received the broadcast and forwards to a connected Access port on Vlan 10. SW4 received the broadcast on trunk port but does not forward to access port since no access port with Vlan 10 membership. Now, after enabling VTP pruning on all the switches, let’s see what change happens from the previous scenario.

Is Vlan 10 relayed to SW1?

Once it is enabled, the broadcast on Vlan 10 from SW2 is forwarded to SW1 however, it is not relayed to all trunk ports. Seeing that no Access port membership is there on SW4, the Broadcast of Vlan pruning is only relayed to trunk port of SW3 and not towards SW4.

What is VLAN trunking?

VLAN trunking enables the movement of traffic to different parts of the network configured as a VLAN. A trunk is a point-to-point link between two network devices that carry more than one VLAN. With VLAN trunking, you can extend your configured VLAN across the entire network.

What is VLAN trunking protocol?

VLAN Trunking Protocol (VTP) is a Cisco-proprietary link protocol, it provides a means by which Cisco. switches can exchange VLAN configuration information.

What is VTP in switches?

switches can exchange VLAN configuration information. In effect, VTP advertises about the existence of each VLAN based on its VLAN ID and the VLAN name. VTP serves a useful purpose, It enables the distribution of VLAN configuration among switches.

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