Configuring Catalyst 3550 Ethernet Switches

The Catalyst 3550 is an extremely versatile switch. With the EMI image installed, the switch essent of the configuration options of the Cisco IOS Software found on a router. General management anc functions are configured just like they are on a router. For instance, the host name, enable passwo protocols, and IP addresses are all configured just as you would configure them on a router. If you experienced with configuring Catalyst 2900XL/35xx series switches and Cisco routers, you'll find co Catalyst 3550 a familiar environment. The remaining sections of this chapter focus primarily on coi switching aspects of the Catalyst 3550.

LAN switches were designed to be easy to install and configure. On smaller networks, little to no co might be requii-ed. On lmge redundant networks, with multiple VLANs and trunks, switching becom •ask. Configuring Ethernet switching on the Catalyst 3550 requires a seven-step process, as follow;

Step 1. Configure s witch management.

Step 2. Configure VTP and VLANs and assign ports/interfaces to VLANs.

Step 3. Configure connections between switches using EtherChannel, 802.1Q, or ISL encaps

Step 4. Optional: Control STP and VLAN propagation.

Step 5. Optional: Configure SVIs.

Step 6. Optional: Configure routed ports.

Step 7. Optional: Configure Layer 3 switchi ngt

Step 1 involves configuring the management VLAN, IP addresses, and default gateways on the swit can be accerred m-band from the inte rnetwork.

Step 2 is where you define the VTP domain and the VLANs on the VTP servers or transparent mode During this step , you als o assign ports to VLAN s.

Step 3 involves conh¡gEring VLAN trunks, it there are any on the netwo rk.

Step) 4 is optional but cVi^a! to la rge networks. It involves controllin g STP th rough tne setting oi rc Clean ng VLANs bro m tsrnks, and msing V aAN pru ne ^ligitrnityf.

Whereas Steps 1 thmou gh 4 c ah bC neLfptmed for mos t Cata l yst series switches, Steps 5 and 6 appl Comaly^ 355(3. Step 5 involves configuring SV ws, whic h can be Dor inter-VLAN connectivity.

Step 6 calls for you to configure routed ports. Routed ports are used when you want to put a static ahd rrso o n an in terface, and you wa nt the interface no behave like a normal router interface; that i taggmg wilI orcur on the ^t^face und no VIJCN infotmation wiN be sent c A routed intetfa ce will, of routaLle. The EMI soMtware ne eds to be install ed for route d in terfaces.

Step 7 also app piea only to switches wit h t Iii EMI software i nnta Hed. Laye r 3 swischin g for alt intent purposes means nn abling a wouti ng ntotocol on th e switch .

Step 1: Configuring Switch Management

All Catalyst switches have the capability to be managed remotely by an IP address. The Catalyst 3! default, uses Dynamic Host Configuration Protocol (DHCP) to resolve a default gateway on virtual i If a DHCP server is not available, an IP address and default gateway can be assigned manually. To this, you must assign an IP address to the switch, along with a default gateway or default route foi forward on. The default management VLAN is VLAN 1; you can specify another VLAN.

The Cisco IOS Software on Catalyst 3550 resembles a router with a special VLAN database added t capability to create multiple VLAN interfaces (SVIs). The commands for assigning ports, trunks, an management are all performed from within the global configuration mode on the switch. VLAN info VLANs 1 through 1001, and VTP information, is configured from either the global configuration moi configuration mode, sometimes referred to as the VLAN database. Keying in vlan database from t enable/privileged mode accesses the VLAN configuration mode, or VLAN database.

The 3550 switch has a default virtual interface called interface VLAN 1. This is the default VLAN for and is in an admi nistratively Down state. To assign a management IP address, enter an IP address VLAN interface mode and activate the virtual interface with the no shutdown command. If VLAN 1 for management, the interface becomes active and no further configuration is necessary. Example dem onstrates how to configure the management interface on VLAN 1.

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