Cisco Catalyst 6880-X Specifications download pdf (Page 67)

Distribution Layer April 2014

Procedure 2 Configure LAN switch universal settings

In this design, there are features and services that are common across all LAN switches, regardless of the type

of platform or role in the network. These are system settings that simplify and secure the management of the

solution.

This procedure provides examples for some of those settings. The actual settings and values will depend on your

current network configuration.

Table 5 - Common network services used in the design examples

Setting Value

Domain Name cisco.local

Active Directory, DNS, DHCP Server 10.4.48.10

Authentication Control System 10.4.48.15

Network Time Protocol Server 10.4.48.17

EIGRP Named Mode Configuration Name CAMPUS

EIGRP AS or OSPF AS 100

Multicast Range 239.1.0.0/16

Step 1: Configure the device hostname to make it easy to identify the device.

hostname [hostname]

Step 2: If the switch VTP mode has been changed from default, configure VTP transparent mode. This design

uses VTP transparent mode because the benefits of dynamic propagation of VLAN information across the

network are not worth the potential for unexpected behavior resulting from operational error.

VLAN Trunking Protocol (VTP) allows network managers to configure a VLAN in one location of the network and

have that configuration dynamically propagate out to other network devices. However, in most cases, VLANs are

defined once during switch setup with few, if any, additional modifications.

vtp mode transparent

Step 3: Enable Rapid Per-VLAN Spanning-Tree (PVST+). Rapid PVST+ provides an instance of RSTP (802.1w) per

VLAN. Rapid PVST+ greatly improves the detection of indirect failures or linkup restoration events over classic

spanning tree (802.1D).

Although this architecture is built without any Layer 2 loops, you should still enable spanning tree with the most

up-to-date network safeguards. By enabling spanning tree, you ensure that if any physical or logical loops are

accidentally configured, no actual layer 2 loops occur.

spanning-tree mode rapid-pvst

Step 4: Set the distribution layer switch to be the spanning-tree root for all VLANs on access layer switches or

appliances that you are connecting to the distribution switch.

spanning-tree vlan 1-4094 root primary

Step 5: Enable Unidirectional Link Detection (UDLD) as the default for fiber ports.

UDLD is a Layer 2 protocol that enables devices connected through fiber-optic or twisted-pair Ethernet cables to

monitor the physical configuration of the cables and detect when a unidirectional link exists. When UDLD detects

a unidirectional link, it disables the affected interface and alerts you. Unidirectional links can cause a variety

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Cisco Catalyst 6880-X Specifications Page 67