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© 1999, Cisco Systems, Inc. 6-1 Chapter 6 Catalyst Switch Operations.

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Presentation on theme: "© 1999, Cisco Systems, Inc. 6-1 Chapter 6 Catalyst Switch Operations."— Presentation transcript:

1 © 1999, Cisco Systems, Inc. 6-1 Chapter 6 Catalyst Switch Operations

2 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-2 Objectives Upon completion of this chapter, you will be able to perform the following tasks: Describe Layer 2 switching (bridging) operations Describe the Catalyst 1900 switch operations Describe the Catalyst 1900 switch default configuration Configure Catalyst 1900 switch Use show commands to verify Catalyst 1900 switch configuration and operations

3 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-3 Address learning Forward/filter decision Loop avoidance Three Switch Functions

4 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-4 How Switches Learn Host Locations Initial MAC address table is empty MAC address table 0260.8c01.1111 0260.8c01.2222 0260.8c01.3333 0260.8c01.4444 E0E1 E2E3 AB CD

5 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-5 How Switches Learn Hosts Locations Station A sends a frame to Station C Switch caches station A MAC address to port E0 by learning the source address of data frames The frame from station A to station C is flooded out to all ports except port E0 (unknown unicasts are flooded) MAC address table 0260.8c01.1111 0260.8c01.2222 0260.8c01.3333 0260.8c01.4444 E0: 0260.8c01.1111 E0E1 E2E3 DC BA

6 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-6 How Switches Learn Host Locations Station D sends a frame to station C Switch caches station D MAC address to port E3 by learning the source Address of data frames The frame from station D to station C is flooded out to all ports except port E3 (unknown unicasts are flooded) MAC address table 0260.8c01.1111 0260.8c01.2222 0260.8c01.3333 0260.8c01.4444 E0: 0260.8c01.1111 E3: 0260.8c01.4444 E0E1 E2E3 DC A B

7 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-7 How Switches Filter Frames Station A sends a frame to station C Destination is known, frame is not flooded E0: 0260.8c01.1111 E2: 0260.8c01.2222 E1: 0260.8c01.3333 E3: 0260.8c01.4444 0260.8c01.1111 0260.8c01.2222 0260.8c01.3333 0260.8c01.4444 E0E1 E2 E3 X X X X D C AB MAC address table

8 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-8 Broadcast and Multicast Frames Station D sends a broadcast or multicast frame Broadcast and multicast frames are flooded to all ports other than the originating port 0260.8c01.1111 0260.8c01.2222 0260.8c01.3333 0260.8c01.4444 E0E1 E2E3 DC AB E0: 0260.8c01.1111 E2: 0260.8c01.2222 E1: 0260.8c01.3333 E3: 0260.8c01.4444 MAC address table

9 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-9 Redundant Topology Redundant topology eliminates single points of failure Redundant topology causes broadcast storms, multiple frame copies, and MAC address table instability problems Segment 1 Segment 2 Server/host X Router Y

10 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-10 Broadcast Storms Segment 1 Segment 2 Server/host X Router Y Broadcast Switch A Switch B Host X sends a Broadcast

11 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-11 Broadcast Storms Segment 1 Segment 2 Server/host X Router Y Broadcast Switch ASwitch B Host X sends a Broadcast

12 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-12 Broadcast Storms Segment 1 Segment 2 Server/host X Router Y Broadcast Switches continue to propagate broadcast traffic over and over Switch ASwitch B

13 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-13 Multiple Frame Copies Segment 1 Segment 2 Server/host X Router Y Unicast Switch A Switch B Host X sends an unicast frame to router Y Router Y MAC address has not been learned by either switch yet

14 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-14 Multiple Frame Copies Segment 1 Segment 2 Server/host X Router Y Unicast Switch A Switch B Host X sends an unicast frame to Router Y Router Y MAC Address has not been learned by either Switch yet Router Y will receive two copies of the same frame Unicast

15 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-15 MAC Database Instability Segment 1 Segment 2 Server/host X Router Y Unicast Switch A Switch B Host X sends an unicast frame to Router Y Router Y MAC Address has not been learned by either Switch yet Switch A and B learn Host X MAC address on port 0 Port 0 Port 1 Port 0 Port 1

16 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-16 MAC Database Instability Segment 1 Segment 2 Server/host X Router Y Unicast Switch A Switch B Host X sends an unicast frame to Router Y Router Y MAC Address has not been learned by either Switch yet Switch A and B learn Host X MAC address on port 0 Frame to Router Y is flooded Switch A and B incorrectly learn Host X MAC address on port 1 Port 0 Port 1 Port 0 Port 1

17 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-17 Complex topology can cause multiple loops to occur Layer 2 has no mechanism to stop the loop Server/host Workstations Loop Multiple Loop Problems Broadcast

18 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-18 Solution: Spanning-Tree Protocol Provides a loop free redundant network topology by placing certain ports in the blocking state Block x

19 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-19 Spanning-Tree Operations One root bridge per network One root port per nonroot bridge One designated port per segment x Designated port (F)Root port (F) Designated port (F) Nondesignated port (B) Root bridgeNonroot bridge SW X SW Y 100baseT 10baseT

20 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-20 Switch Y Default priority 32768 (8000 hex) MAC 0c0022222222 Switch X Default priority 32768 (8000 hex) MAC 0c0011111111 Spanning-Tree Protocol Root Bridge Selection BPDU BPDU = Bridge protocol data unit (default = sent every 2 seconds) Root bridge = Bridge with the lowest bridge ID Bridge ID = Bridge priority + bridge MAC address In the example, which switch has the lowest bridge ID?

21 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-21 Switch Y Default priority 32768 MAC 0c0022222222 Switch X Default priority 32768 MAC 0c0011111111 Spanning-Tree Protocol Port States Root bridge x Port 0 Port 1 Port 0 Port 1 100baseT 10baseT Designated port (F)Root port (F) Nondesignated port (B)Designated port (F)

22 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-22 Spanning-Tree Protocol Path Cost Link SpeedCost (reratify IEEE spec) Cost (previous IEEE spec) ---------------------------------------------------------------------------------------------------- 10 Gbps 21 1 Gbps41 100 Mbps1910 10 Mbps100100

23 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-23 Switch Y MAC 0c0022222222 Default priority 32768 Switch X MAC 0c0011111111 Default priority 32768 Port 0 Port 1 Port 0 Port 1 Switch Z Mac 0c0011110000 Default priority 32768 Port 0 Can you figure out: What is the root bridge? What are the designated, nondesignated, and root parts? Which are the forwarding and blocking ports? 100baseT Spanning-Tree:

24 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-24 Switch Y MAC 0c0022222222 Default priority 32768 Switch X MAC 0c0011111111 Default priority 32768 Port 0 Port 1 Port 0 Port 1 Switch Z Mac 0c0011110000 Default priority 32768 Port 0 Can you figure out: What is the root bridge? What are the designated, nondesignated, and root parts? Which are the forwarding and blocking ports? 100baseT Spanning-Tree: Designated port (F) Root port (F) Nondesignated port (BLK)Designated port (F) Root port (F)

25 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-25 Blocking Listening Learning Forwarding Spanning-Tree Port States Spanning-tree transitions each port through several different state:

26 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-26 Spanning-Tree Recalculation Switch Y MAC 0c0022222222 Default priority 32768 Switch X MAC 0c0011111111 Default priority 32768 Port 0 Port 1 Port 0 Port 1 10baseT x x 100baseT Root Bridge Designated portRoot port (F) Nondesignated port (BLK)Designated port

27 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-27 Switch Y MAC 0c0022222222 Default priority 32768 Switch X MAC 0c0011111111 Default priority 32768 Port 0 Port 1 Port 0 Port 1 10baseT x x 100baseT Root Bridge Designated portRoot port (F) Nondesignated port (BLK)Designated port BPDU x x MAXAGE x x Spanning-Tree Recalculation

28 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-28 Key Issue: Time to Convergence Convergence occurs when all the switches and bridge ports have transitioned to either the forwarding or blocking state When network topology changes, switches and bridges must recompute the Spanning-Tree Protocol, which disrupts user traffic

29 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-29 Primarily software based One spanning-tree instance per bridge Usually up to 16 ports per bridge Bridging Primarily hardware based (ASIC) Many spanning-tree instances per switch More ports on a switch LAN Switching Bridging Compared to LAN Switching

30 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-30 Transmitting Frames Through a Switch Cut-through Switch checks destination address and immediately begins forwarding frame Frame

31 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-31 Transmitting Frames through a Switch Store and forward Complete frame is received and checked before forwarding Cut-through Switch checks destination address and immediately begins forwarding frame Frame

32 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-32 Transmitting Frames through a Switch Cut-through Switch checks destination address and immediately begins forwarding frame Frame Fragment free (modified cut-through)—Cat1900 Default Switch checks the first 64 bytes then immediately begins forwarding frame Frame Store and forward Complete frame is received and checked before forwarding Frame

33 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-33 Duplex Overview Half duplex (CSMA/CD) Unidirectional data flow Higher potential for collison Hubs connectivity Switch Hub

34 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-34 Duplex Overview Half duplex (CSMA/CD) Unidirectional data flow Higher potential for collison Hubs connectivity Switch Hub Full duplex Point-to-point only Attached to dedicated switched port Requires full-duplex support on both ends Collision free Collision detect circuit disabled

35 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-35 Configuring the Switch Catalyst 1900 –Menu driven interface –Web-based VSM (Visual Switch Manager) –IOS CLI (command-line interface)

36 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-36 Catalyst 1900 Default Configurations IP address: 0.0.0.0 CDP: Enabled Switching mode: fragment free 100baseT port: Auto-negotiate duplex mode 10baseT port: Half duplex Spanning Tree: Enabled Console password: none

37 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-37 Ports on the Catalyst 1900 Cat1912Cat1924 10baseT ports AUI port 100baseT uplink ports e0/1 to e0/12e0/1 to e0/24 e0/25 fa0/26 (port A) fa0/27 (port B) fa0/26 (port A) fa0/27 (port B)

38 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-38 Ports on the Catalyst 1900 wg_sw_d#sh run Building configuration... Current configuration: ! interface Ethernet 0/1 ! interface Ethernet 0/2 wg_sw_d#sh span Port Ethernet 0/1 of VLAN1 is Forwarding Port path cost 100, Port priority 128 Designated root has priority 32768, address 0090.8673.3340 Designated bridge has priority 32768, address 0090.8673.3340 Designated port is Ethernet 0/1, path cost 0 Timers: message age 20, forward delay 15, hold 1 wg_sw_a#show vlan-membership Port VLAN Membership Type Port VLAN Membership Type ------------------------------------------------------------------ 1 5 Static 13 1Static 2 1 Static 14 1 Static 3 1 Static15 1 Static

39 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-39 Configuring the Switch Configuration Modes Global configuration mode wg_sw_a# conf term wg_sw_a(config)# Interface configuration mode wg_sw_a(config)# interface e0/1 wg_sw_a(config-if)#

40 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-40 Configuring the Switch IP Address wg_sw_a(config)# ip address {ip address} {mask}

41 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-41 wg_sw_a(config)#ip address 10.5.5.11 255.255.255.0 Configuring the Switch IP Address wg_sw_a(config)# ip address {ip address} {mask}

42 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-42 wg_sw_a(config)# ip default-gateway {ip address} Configuring the Switch Default Gateway

43 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-43 wg_sw_a(config)#ip default-gateway 10.5.5.3 wg_sw_a(config)# ip default-gateway {ip address} Configuring the Switch Default Gateway

44 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-44 Showing the Switch IP Address wg_sw_a#show ip IP address: 10.5.5.11 Subnet mask: 255.255.255.0 Default gateway: 10.5.5.3 Management VLAN: 1 Domain name: Name server 1: 0.0.0.0 Name server 2: 0.0.0.0 HTTP server: Enabled HTTP port: 80 RIP: Enabled wg_sw_a#

45 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-45 Speed and Duplex Options wg_sw_a(config)#interface e0/1 wg_sw_a(config-if)# duplex {auto | full | full-flow-control | half}

46 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-46 Setting Duplex Options wg_sw_a(config-if)#duplex half wg_sw_a(config)#interface e0/1 wg_sw_a(config-if)# duplex {auto | full | full-flow-control | half}

47 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-47 Showing Duplex Options

48 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-48 Duplex Mismatches The manually set duplex parameter differs between connected ports The switch port is in autonegotiate and the attached port is set to full duplex with no auto-negotiation capability causing the switch port to be in half-duplex mode

49 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-49 FCS and Late Collision Errors

50 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-50 Managing Mac Address Table wg_sw_a#show mac-address-table

51 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-51 Managing Mac Address Table wg_sw_a#sh mac-address-table Number of permanent addresses : 0 Number of restricted static addresses : 0 Number of dynamic addresses : 6 Address Dest Interface Type Source Interface List ------------------------------------------------------------------------------------------------- 00E0.1E5D.AE2F Ethernet 0/2 Dynamic All 00D0.588F.B604 FastEthernet 0/26 Dynamic All 00E0.1E5D.AE2B FastEthernet 0/26 Dynamic All 0090.273B.87A4 FastEthernet 0/26 Dynamic All 00D0.588F.B600 FastEthernet 0/26 Dynamic All 00D0.5892.38C4 FastEthernet 0/27 Dynamic All wg_sw_a#show mac-address-table

52 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-52 Setting Permanent MAC Address wg_sw_a(config)# mac-address-table permanent {mac-address type module/port}

53 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-53 Setting Permanent MAC Address wg_sw_a(config)# wg_sw_a(config)#mac-address-table permanent 2222.2222.2222 ethernet 0/3 mac-address-table permanent {mac-address type module/port}

54 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-54 Setting Permanent MAC Address wg_sw_a#sh mac-address-table Number of permanent addresses : 1 Number of restricted static addresses : 0 Number of dynamic addresses : 4 Address Dest Interface Type Source Interface List -------------------------------------------------------------------------------------------------------------- 00E0.1E5D.AE2FEthernet 0/2DynamicAll 2222.2222.2222Ethernet 0/3Permanent All 00D0.588F.B604FastEthernet 0/26 Dynamic All 00E0.1E5D.AE2BFastEthernet 0/26 Dynamic All 00D0.5892.38C4FastEthernet 0/27 Dynamic All wg_sw_a(config)# wg_sw_a(config)#mac-address-table permanent 2222.2222.2222 ethernet 0/3 mac-address-table permanent {mac-address type module/port}

55 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-55 Setting Restricted Static MAC Address wg_sw_a(config)# mac-address-table restricted static {mac-address type module/port src-if-list}

56 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-56 Setting Restricted Static MAC Address wg_sw_a(config)#mac-address-table restricted static 1111.1111.1111 e0/4 e0/1 wg_sw_a(config)# mac-address-table restricted static {mac-address type module/port src-if-list}

57 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-57 Setting Restricted Static MAC Address wg_sw_a#sh mac-address-table Number of permanent addresses : 1 Number of restricted static addresses : 1 Number of dynamic addresses : 4 Address Dest Interface Type Source Interface List ----------------------------------------------------------------------------------------------- 1111.1111.1111Ethernet 0/4StaticEt0/1 00E0.1E5D.AE2FEthernet 0/2 DynamicAll 2222.2222.2222Ethernet 0/3Permanent All 00D0.588F.B604FastEthernet 0/26 Dynamic All 00E0.1E5D.AE2BFastEthernet 0/26 Dynamic All 00D0.5892.38C4FastEthernet 0/27 Dynamic All wg_sw_a(config)#mac-address-table restricted static 1111.1111.1111 e0/4 e0/1 wg_sw_a(config)# mac-address-table restricted static {mac-address type module/port src-if-list}

58 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-58 Configuring Port Security wg_sw_a(config-if)# Configures an interface to be a secured port Define a maximum number of mac addresses allowed in the address table for this port Count can be from 1 to 132 Default is 132 port secure [max-mac-count count]

59 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-59 Configuring Port Security wg_sw_a(config-if)# Configures an interface to be a secured port Define a maximum number of mac addresses allowed in the address table for this port Count can be from 1 to 132 Default is 132 wg_sw_a(config)#interface e0/4 wg_sw_a(config-if)#port secure max-mac-count 1 port secure [max-mac-count count]

60 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-60 Configuring Port Security wg_sw_a#show mac-address-table security Action upon address violation : Suspend Interface Addressing Security Address Table Size ------------------------------------------------------------------------------------ Ethernet 0/1 Disabled N/A Ethernet 0/2 Disabled N/A Ethernet 0/3 Disabled N/A Ethernet 0/4 Enabled 1 Ethernet 0/5 Disabled N/A Ethernet 0/6 Disabled N/A Ethernet 0/7 Disabled N/A Ethernet 0/8 Disabled N/A Ethernet 0/9 Disabled N/A Ethernet 0/10 Disabled N/A Ethernet 0/11 Disabled N/A Ethernet 0/12 Disabled N/A

61 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-61 Configuring Port Security wg_sw_a#show mac-address-table security wg_sw_a(config)#address-violation {suspend | disable | ignore} wg_sw_a#show mac-address-table security Action upon address violation : Suspend Interface Addressing Security Address Table Size ------------------------------------------------------------------------------------ Ethernet 0/1 Disabled N/A Ethernet 0/2 Disabled N/A Ethernet 0/3 Disabled N/A Ethernet 0/4 Enabled 1 Ethernet 0/5 Disabled N/A Ethernet 0/6 Disabled N/A Ethernet 0/7 Disabled N/A Ethernet 0/8 Disabled N/A Ethernet 0/9 Disabled N/A Ethernet 0/10 Disabled N/A Ethernet 0/11 Disabled N/A Ethernet 0/12 Disabled N/A

62 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-62 Show Version

63 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-63 Managing Configuration File copy nvram tftp://host/dst_file wg_sw_a# To send the configuration to a TFTP server:

64 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-64 Managing Configuration File copy tftp://host/src_file nvram copy nvram tftp://host/dst_file wg_sw_a# To send the configuration to a TFTP server: wg_sw_a# To download the configuration from a TFTP server:

65 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-65 copy tftp://host/src_file nvram wg_sw_a#copy nvram tftp://10.1.1.1/wgswd.cfg Configuration upload is successfully completed wg_sw_a#copy tftp://10.1.1.1/wgswd.cfg nvram TFTP successfully downloaded configuration file copy nvram tftp://host/dst_file wg_sw_a# Managing Configuration File To send the configuration to a TFTP server: To download the configuration from a TFTP server:

66 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-66 Clear NVRAM wg_sw_d#delete nvram Resets the system configuration to factory defaults.

67 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-67 Visual Objective core_ server (tftp server) 10.1.1.1 wg_sw_a 10.1.1.10 wg_sw_l 10.1.1.120 wg_pc_a wg_pc_l... e0/1 fa0/26 (port A) fa0/1fa0/12 fa0/24 core_sw_a 10.1.1.2 podsw ro’s e0 A10.1.1.1010.1.1.11 B10.1.1.2010.1.1.21 C10.1.1.3010.1.1.31 D10.1.1.4010.1.1.41 E10.1.1.5010.1.1.51 F10.1.1.6010.1.1.61 G10.1.1.7010.1.1.71 H10.1.1.8010.1.1.81 I10.1.1.9010.1.1.91 J10.1.1.100 10.1.1.101 K10.1.1.110 10.1.1.111 L10.1.1.120 10.1.1.121 wg_ro_a 10.1.1.11 wg_ro_l 10.1.1.121 fa0/26 (port A) e0/2 e0

68 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-68 Summary After completing this chapter, you should be able to perform the following tasks: Describe Layer 2 switching (bridging) operations Describe the Catalyst 1900 switch operations Describe the Catalyst 1900 switch’s default configuration Configure Catalyst 1900 switch Use show commands to verify Catalyst 1900 switch configuration and operations

69 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-69 Review Questions 1. What function does Spanning-Tree Protocol provide? 2. What are the different spanning-tree port states? 3. Describe the difference between full-duplex and half-duplex operations. What is the default duplex setting on the Catalyst 1900 10Mbps port and 100Mbps port? 4. What is the default switching mode on the Catalyst 1900?

70 © 1999, Cisco Systems, Inc. www.cisco.com ICND—6-70 Review Questions 5. What is the Catalyst 1900 CLI command to assign an IP address to the switch? Why does a Layer 2 switch require an IP address? 6. Which type of MAC address does not age, permanent or dynamic? 7. What is the Dynamic 1900 CLI command to display the contents of the MAC address table?

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