Cisco 4506-E Software Guide - Page 430

Migrating a Supervisor Engine II from a Catalyst 4006 Switch to a Catalyst 4500 Series Switch Chapter 28 Power Management Table 28-2 Power Consumption for Catalyst 4500 Series and 4000 Series Components (continued) Module 48-port 1000BASE-X Gigabit Ethernet WS-X4448-GB-LX 48-port Telco 10/100BASE-TX switching module WS-X4148-RJ21 48-port inline power 10/100BASE-TX switching module WS-X4148-RJ45V 4-port MT-RJ uplink module WS-U4504-FX-MT 48-port MT-RJ 100BASE-LX switching module WS-X4148-FE-LX-MT 48-port 10/100/1000BASE-T switching module WS-X4548-GB-RJ45 2-port 1000BASE-X (GBIC) Gigabit Ethernet WS-X4302-GB Power Consumed During Operation (W) 90 Power Consumed in Reset Mode (W) 50 65 40 60 50 10 10 88 10 58 15 35 30 Migrating a Supervisor Engine II from a Catalyst 4006 Switch to a Catalyst 4500 Series Switch If you migrate a Supervisor Engine II from a Catalyst 4006 switch to a Catalyst 4503 or 4506 switch, save your configuration and reload the configuration file after you insert the supervisor engine into the Catalyst 4500 series chassis. The Catalyst 4006 switch has 1024 MAC addresses that you can use as bridge identifiers; the Catalyst 4500 series switches have 64 MAC addresses. MAC address reduction is always enabled on the Catalyst 4500 series switches; however, MAC address reduction may or may not be enabled on a Catalyst 4006 switch. This might affect the selection of the root bridge after you migrate your supervisor engine. Here are two scenarios to consider: • The Catalyst 4006 switch is not a root switch In this case, the spanning tree topology does not change. If you add a Catalyst 4500 series switch with MAC reduction enabled and a default spanning tree bridge ID priority set to 32,768 to the network, the bridge ID priority of the new switch becomes the bridge ID priority that is added to a system ID extension. The system ID extension, which is the VLAN number, can vary from 1 to 4094. If the switch is in VLAN 1, the new bridge ID priority will be 32,789. Because 32,769 is greater than 32,768, this switch cannot become the root switch. • The Catalyst 4006 switch is a root switch In this case, the spanning tree topology may change. If the other switches in the network are not running MAC address reduction, the topology will change after you replace the chassis with a Catalyst 4500 series switch. The bridge ID priority of the new Catalyst 4500 series switch increments in the same manner as in the previous scenario (bridge ID priority + VLAN number). If the switch is in VLAN 1, the new bridge ID will be 32,789. Because 32,769 is greater than 32,768, this switch cannot become the root switch. The network designates a new root switch; the spanning tree topology also changes to reflect the new root switch. 28-10 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 78-15486-01