Cisco Systems 3750 manual Related Information, Troubleshooting Procedure, ∙ show trunk

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200.1.1.1disabled disabled 2−1000

show trunk

Cat2948G> (enable) show trunk

 

 

* − indicates vtp domain mismatch

 

 

Port

Mode

Encapsulation

Status

Native vlan

−−−−−−−−

−−−−−−−−−−−

−−−−−−−−−−−−−

−−−−−−−−−−−−

−−−−−−−−−−−

2/49

desirable

dot1q

trunking

1

Port

Vlans allowed on trunk

 

 

−−−−−−−−

−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

2/49

1−1005

 

 

 

Port

Vlans allowed and active in management domain

−−−−−−−−

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2/49

1−3,10

 

 

 

Port

Vlans in spanning tree forwarding state and not pruned

−−−−−−−−

−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

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1−3,10

 

 

 

Troubleshoot

This section provides information you can use to troubleshoot your configuration.

Troubleshooting Procedure

Follow the instructions below to troubleshoot your configuration.

1.If you are not able to ping devices within the same VLAN, you should check the VLAN assignment of the source and destination ports by issuing the show port mod/port command for CatOS and the show interface status command for Cisco IOS® Software, to make sure they are in the same VLAN. If they are not in the same switch, make sure that trunking is configured properly by issuing the show trunk command for CatOS and the show interfaces trunk command for Cisco IOS Software, and that the native VLAN is matching on either side. Make sure the subnet mask is matching between the source and destination devices.

2.If you are not able to ping devices in different VLANs, make sure you can ping the respective default gateway (refer to step 1 above). Also, make sure the device's default gateway is pointing to the correct VLAN interface IP address and that the subnet mask is matching.

3.If you are able to reach the Internet, make sure the default route on the 3750 points to the correct IP address, and that the subnet address matches the Internet gateway router by issuing the show ip interface interface−id and show ip route commands. Make sure that the Internet gateway router has routes to the Internet and the internal networks.

Related Information

Creating Ethernet VLANs on Catalyst Switches

LAN Switching Technology Support

Catalyst LAN and ATM Switches Product Support

Technical Support − Cisco Systems

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Cisco − Configuring Inter−VLAN Routing with Catalyst 3750 Series Switches in a Stacked Configuration

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Contents Table of Contents Document ID IntroductionBefore You Begin ConventionsIP Routing on a Stack of 3750s Components UsedBackground Theory Related Products ConfigureNetwork Diagram Practical Tips Configurations Switchport mode access Switchport trunk encapsulation dot1qSwitchport access vlan No switchportIp address 10.1.10.1 Ip address 10.1.2.1Ip address 10.1.3.1 Ip route 0.0.0.0 0.0.0.0Cat2950#show running−config Switchport access vlan 3 switchport mode accessIp default−gateway Ip address 10.1.10.2Set vtp domain cisco Set vtp mode clientSet ip route 0.0.0.0/0.0.0.0 10.1.10.1 #set boot command Set interface sc0 10 10.1.10.3/255.255.255.0∙ show interfaces trunk Verify∙ show vtp status ∙ show ip route∙ show vtp domain Related Information Troubleshooting ProcedureTroubleshoot ∙ show trunkUpdated Mar 10 Document ID
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3750 specifications

The Cisco Systems 3750 series is a family of enterprise-class stackable switches that were designed to provide high-performance networking solutions for organizations requiring robust management features, security, and scalability. Known for their reliability and advanced capabilities, the 3750 series is particularly aimed at accommodating the demands of LAN environments in organizations ranging from small businesses to large enterprises.

One of the defining features of the Cisco 3750 series is its StackWise technology. This innovative feature enables the stacking of up to nine switches together, allowing them to function as a single logical unit. This results in simplified management, higher redundancy, and increased scalability. The StackWise technology allows for seamless failover and enhanced bandwidth between the stacked switches.

In terms of performance, the 3750 series supports Layer 2 and Layer 3 switching, offering routing capabilities to handle both traditional and modern network demands. It is equipped with advanced Quality of Service (QoS) features, ensuring that critical applications such as voice and video are prioritized for optimal performance.

The Cisco 3750 also features extensive security capabilities. It incorporates features such as IEEE 802.1X authentication, DHCP snooping, and dynamic ARP inspection to protect against unauthorized access and various network attacks. These enhancements help maintain data integrity and secure communications across the network.

Another noteworthy characteristic of the 3750 series is its support for Power over Ethernet (PoE). PoE allows for the delivery of power over Ethernet cables to connected devices, such as IP phones and wireless access points, facilitating simpler installations and reducing the need for additional power outlets.

The Cisco 3750 series also provides a comprehensive set of management tools. With features like Cisco's Embedded Event Manager (EEM) and extensive SNMP support, network administrators can efficiently monitor and manage network performance, troubleshoot issues, and maintain high availability.

Additionally, the series is compatible with Cisco's IOS software, which provides a rich set of features, including advanced routing protocols, multicast support, and extensive security options, further enhancing the functionality and versatility of the switches.

Overall, the Cisco Systems 3750 series stands out for its stackable design, high-performance features, security capabilities, and management tools, making it a popular choice for organizations looking for dependable and scalable networking solutions.