|
|
This chapter provides an overview of the Catalyst 5000 series switches, and is divided into the following sections:
The Catalyst 5000 series is a line of modular LAN switches that includes the following switches:
Table 1-1 lists and describes the Catalyst 5000 series switches.
| Switch | Description | Features |
|---|---|---|
| Catalyst 5002 (see Figure 1-1) | 2-slot switch |
|
|
Catalyst 5000 | 5-slot switch | |
|
Catalyst 5505 | 5-slot switch |
|
|
Catalyst 5500 | 13-slot switch |
|
Refer to the Catalyst 5000 Series Installation Guide for information on installing all Catalyst 5000 series switches. To configure the software for all Catalyst 5000 series switches, refer to the Catalyst 5000 Series Software Configuration Guide.
The Catalyst 5000 series switches can contain any combination of the following hot-swappable modules, except where noted:
This section describes the port densities supported by Catalyst 5000 series switches and the module hot-swapping feature.
The Catalyst 5000 series switches support different maximum port densities for the various combinations of network interface modules.
The port densities for the two-slot Catalyst 5002 switch are as follows:
The port densities for the five-slot Catalyst 5000 switch are as follows:
The port densities for the five-slot Catalyst 5505 switch are as follows:
The port densities for the 13-slot Catalyst 5500 switch are as follows:
Each port (or interface) in the switch is designated by several different types of addresses. The physical interface address is the actual physical location (slot and port) of the interface connector within the chassis. The system software uses the physical addresses to control activity within the switch and to display status information. These physical slot and port addresses are not used by other devices in the network; they are specific to the individual switch and its internal components and software. For more information, see the "Physical Interface Addresses" section.
A second type of address is the Media Access Control (MAC)-layer address, which is a standardized data link layer address that is required for every port or device that connects to a network. Other devices in the network use these addresses to locate specific ports in the network and to create and update routing tables and data structures. The switches use a unique method, described in the "MAC Addresses" section in this chapter, to assign and control the MAC-layer addresses of their interfaces.
Physical port addresses specify the actual physical location of each module port on the rear of the switch, as shown in Figure 1-5, for the Catalyst 5500 switch. The address is a two-part number in the format slot/port number. The first number identifies the slot in which the module is installed. Module slots are numbered from top to bottom starting with 1. The second number identifies the physical port number on the module. The port numbers always begin at 1 and are numbered from left to right, facing the rear of the switch. The number of additional ports (n/1, n/2, and so on) depends on the number of ports available on the module.
Interface ports maintain the same address regardless of whether other modules are installed or removed. However, when you move a module to a different slot, the first number in the address changes to reflect the new slot number. For example, on a 12-port 100BaseTX switching module in slot 2, the address of the left port is 2/1 and the address of the right port is 2/12. If you remove the 12-port 100BaseTX switching module from slot 2 and install it in slot 4, the addresses of those same ports become 4/1 through 4/12.
You can identify module ports by checking the slot and port location on the back of the switch. You can also use software commands to display information about a specific interface, or all interfaces, in the switch. To display information about every interface, use the show port command without parameters. To display information about a specific interface, use the show port command with the module (slot) number and port number in the format show port [mod_num/port_num]. If you abbreviate the command (sho po) and do not include parameters, the system interprets the command as show port and displays the status of all interfaces.
This example shows representative output from the show port command:
Console> (enable) show port
Port Name Status Vlan Level Duplex Speed Type
---- -------------------- ---------- ---------- ------ ------ ----- --------------
1/1 Supervisor connected trunk normal half 100 100BaseTX
1/2 notconnect 1 normal half 100 100BaseTX
2/1 notconnect 1 normal half 10 10BaseT
2/2 inactive 3 normal half 10 10BaseT
2/3 notconnect 2 normal half 10 10BaseT
.
.
.
2/24 notconnect 1 normal half 10 10BaseT
4/1 notconnect 1 normal half 10 10BaseT
.
.
.
4/48 notconnect 1 normal half 10 10BaseT
Port Align-Err FCS-Err Xmit-Err Rcv-Err
---- ---------- ---------- ---------- ----------
1/1 0 0 0 0
1/2 0 0 0 0
2/1 0 0 0 0
.
.
.
2/24 0 0 0 0
Port Single-Col Multi-Coll Late-Coll Excess-Col Carri-Sens Runts Giants
---- ---------- ---------- ---------- ---------- ---------- --------- ---------
1/1 0 0 0 0 0 0 -
1/2 0 0 0 0 0 0 -
2/1 0 0 0 0 0 0 0
.
.
.
2/24 0 0 0 0 0 0 0
Port Auto-Parts Giants Data-Rate FCS-Err Runts Rcv-frms Src-Addr
Mismatch Changes
---- ---------- ---------- ---------- ---------- ---------- ---------- --------
4/1 0 0 0 0 0 0 0
4/2 0 0 0 0 0 0 0
.
.
.
4/47 0 0 0 0 0 0 0
4/48 0 0 0 0 0 0 0
Port Rcv-Multi Rcv-Broad Good-Bytes Align-Err Short-Evnt Late-Coll Collision
---- ---------- ---------- ---------- ---------- ---------- --------- ---------
4/1 0 0 0 0 0 0 0
4/2 0 0 0 0 0 0 0
.
.
.
4/47 0 0 0 0 0 0 0
4/48 0 0 0 0 0 0 0
Last-Time-Cleared
--------------------------
Mon March 9 1998, 11:32:28
Console> (enable)
For complete configuration instructions, refer to the Catalyst 5000 Series Software Configuration Guide and the Catalyst 5000 Series Command Reference publication.
All network interface connections (ports) require a unique MAC-layer address. The MAC-layer address of an interface is stored in electrically erasable programmable read-only memory (EEPROM) on a component that resides directly on the interface circuitry. The switch system code reads the EEPROM for each interface in the system, learns the MAC addresses, and then initializes appropriate hardware and data structures. Each virtual LAN (VLAN) in the spanning tree has one unique MAC address.
This addressing scheme gives the switch the intelligence to identify the state (connected or not connected) of each interface. When a module is hot swapped, the MAC-layer address changes with the module. The supervisor engine module also has a list of up to 1024 MAC addresses that it uses for multiple purposes, such as assigning unique identifiers for each VLAN spanning-tree bridge.
The Encoded Address Recognition Logic (EARL) is a custom Catalyst 5000 series switch component similar to the learning bridge or content-addressable memory (CAM) of other types of network switches and routers. The EARL automatically learns source MAC addresses and saves them in a RAM address table with VLAN and port information. The EARL uses port information contained in learned entries to forward a packet to its destination address (DA).
The supervisor engine module has separate hardware supporting switching and network management. Since ASICs fail more rarely than processors, this separation allows the EARL ASIC to forward packets across the switching bus even if the network management processor fails.
Catalyst 5000 series switches allow you to remove and replace switching modules without powering down the switch. This feature is known as hot swapping.
When you remove or insert a switching module while the switch is powered on and operating, the system does the following:
1 ) Scans the backplane for configuration changes.
2 ) Initializes all newly inserted switching modules, notes any removed modules, and places them in the administratively shutdown state.
3 ) Places any previously configured interfaces on the switching module back to the state they were in when they were removed. Any newly inserted interfaces are put in the administratively shutdown state, as if they were present (but unconfigured) at boot time. If you insert a similar switching-module type into a slot, its ports are configured and brought online up to the port count of the original switching module.
The system runs diagnostic tests on any new interfaces. If the test passes, the system is operating normally. If the new switching module is faulty, the system resumes normal operation but leaves the new interface disabled.
If the diagnostic test fails, the system crashes, which usually indicates that the new switching module has a problem in the bus and should be removed.
 Caution
| To avoid erroneous failure messages, allow at least 15 seconds for the system to reinitialize, and note the current configuration of all interfaces before you remove or insert another switching module. |
|
|