Managing MAC table

The MAC address type can either be static or dynamic.

Show the VLAN, MAC address, Type, and Port.

sh mac address-table
          Mac Address Table
-------------------------------------------

Vlan    Mac Address       Type        Ports
----    -----------       --------    -----
 All    0100.0ccc.cccc    STATIC      CPU
   1    0011.321b.6374    DYNAMIC     Po1
   1    0060.2e01.b9ab    DYNAMIC     Gi1/0/22
   6    e063.da86.8322    DYNAMIC     Gi1/0/48
   6    f099.bf03.2158    DYNAMIC     Gi1/0/43
  99    0040.9d43.3597    DYNAMIC     Gi1/0/38
   3    e063.da86.8322    DYNAMIC     Gi1/0/48
   4    e063.da86.8322    DYNAMIC     Gi1/0/48
   5    e063.da86.8322    DYNAMIC     Gi1/0/48
  97    e063.da86.8322    DYNAMIC     Gi1/0/48
  98    e063.da86.8322    DYNAMIC     Gi1/0/48
 971    e063.da86.8322    DYNAMIC     Gi1/0/48
 202    e063.da86.8322    DYNAMIC     Gi1/0/48

STATIC means the MAC address was manually set either from the factory or user.
DYNAMIC means the MAC address was learned dynamically.

Determine the port a MAC address belongs to.

switch#show mac address-table address 588a.5af5.69da
          Mac Address Table
-------------------------------------------

Vlan    Mac Address       Type        Ports
----    -----------       --------    -----
1611    588a.5af5.69da    DYNAMIC     Gi1/0/15

Determine the MAC address for a port.

switch#show mac address-table interface gigabitEthernet 1/0/15 
          Mac Address Table
-------------------------------------------

Vlan    Mac Address       Type        Ports
----    -----------       --------    -----
1611    588a.5af5.69da    DYNAMIC     Gi1/0/15

A port may contain more than one MAC address.

switch#show mac address-table interface gigabitEthernet 1/0/48
          Mac Address Table
-------------------------------------------

Vlan    Mac Address       Type        Ports
----    -----------       --------    -----
   1    e063.da86.8318    DYNAMIC     Gi1/0/48
   1    e063.da86.8322    DYNAMIC     Gi1/0/48
   6    e063.da86.8322    DYNAMIC     Gi1/0/48
  99    e063.da86.8322    DYNAMIC     Gi1/0/48
   3    e063.da86.8322    DYNAMIC     Gi1/0/48
   4    e063.da86.8322    DYNAMIC     Gi1/0/48
   5    e063.da86.8322    DYNAMIC     Gi1/0/48
  97    e063.da86.8322    DYNAMIC     Gi1/0/48
  98    e063.da86.8322    DYNAMIC     Gi1/0/48
 971    e063.da86.8322    DYNAMIC     Gi1/0/48
 202    e063.da86.8322    DYNAMIC     Gi1/0/48
 131    e063.da86.8322    DYNAMIC     Gi1/0/48
   7    e063.da86.8322    DYNAMIC     Gi1/0/48
3939    e063.da86.8322    DYNAMIC     Gi1/0/48
 200    e063.da86.8322    DYNAMIC     Gi1/0/48
 201    e063.da86.8322    DYNAMIC     Gi1/0/48
1612    e063.da86.8322    DYNAMIC     Gi1/0/48
1613    e063.da86.8322    DYNAMIC     Gi1/0/48
1614    e063.da86.8322    DYNAMIC     Gi1/0/48
1615    e063.da86.8322    DYNAMIC     Gi1/0/48
1611    e063.da86.8322    DYNAMIC     Gi1/0/48
1610    e063.da86.8322    DYNAMIC     Gi1/0/48
  32    e063.da86.8322    DYNAMIC     Gi1/0/48
Total Mac Addresses for this criterion: 23

Filter results for only VLAN 202.

switch#show mac address-table interface gigabitEthernet 1/0/48 vlan 202
          Mac Address Table
-------------------------------------------

Vlan    Mac Address       Type        Ports
----    -----------       --------    -----
 202    e063.da86.8322    DYNAMIC     Gi1/0/48
Total Mac Addresses for this criterion: 1

Static interface configuration.

sw-27(config)#mac address-table static 2000.2000.2027 vlan 6 interface tenGigabitEthernet 1/0/1

sw-27#show mac address-table static | i Te1/0/1
   6    2000.2000.2027    STATIC      Te1/0/1

Statically configure a MAC address on an interface.

sw-27(config)#int te 1/0/1
sw-27(config-if)#mac-address 2000.2000.2002

Certain MAC addresses will not work and an error message will appear.

sw-27(config-if)#mac-address 0000.0000.0000
% Malformed hex mac address
sw-27(config-if)#mac-address 1111.1111.1111
% Malformed hex mac address

Verify MAC address on an interface.

sw-27#show interface te 1/0/1 | i address
  Hardware is Ten Gigabit Ethernet, address is 2000.2000.2002 (bia 0c75.bded.1881)

Aging Time

Aging time for all VLANs.

sw-27#show mac address-table aging-time
Global Aging Time:  300
Vlan    Aging Time
----    ----------
  97     123
 131    8340
   5      35
 201     125
 200      30
  99      30
  98     240

Aging time for one VLAN.

sw-27#show mac address-table aging-time vlan 97
Global Aging Time:  300
Vlan    Aging Time
----    ----------
  97     123

MAC Address Count

Number of MAC addresses present in all VLANs

sw-27#show mac address-table count
Mac Entries for Vlan 1:
---------------------------
Dynamic Address Count  : 2
Static  Address Count  : 1
Total Mac Addresses    : 3

Mac Entries for Vlan 6:
---------------------------
Dynamic Address Count  : 1
Static  Address Count  : 0
Total Mac Addresses    : 1

Mac Entries for Vlan 97:
---------------------------
Dynamic Address Count  : 1
Static  Address Count  : 0
Total Mac Addresses    : 1

Mac Entries for Vlan 131:
---------------------------
Dynamic Address Count  : 1
Static  Address Count  : 0
Total Mac Addresses    : 1
          
Mac Entries for Vlan 5:
---------------------------
Dynamic Address Count  : 1
Static  Address Count  : 0
Total Mac Addresses    : 1

Mac Entries for Vlan 201:
---------------------------
Dynamic Address Count  : 1
Static  Address Count  : 0
Total Mac Addresses    : 1

Mac Entries for Vlan 200:
---------------------------
Dynamic Address Count  : 1
Static  Address Count  : 0
Total Mac Addresses    : 1

Mac Entries for Vlan 99:
---------------------------
Dynamic Address Count  : 1
Static  Address Count  : 0
Total Mac Addresses    : 1

Mac Entries for Vlan 3939:
---------------------------
Dynamic Address Count  : 1
Static  Address Count  : 0
Total Mac Addresses    : 1

Total Dynamic Address Count  : 10
Total Static  Address Count  : 1
Total Mac Address In Use     : 11
Total Mac Address Space Available: 32757

Dynamic MAC Addresses

Display only dynamic MAC addresses.

sw-27#show mac address-table dynamic 
          Mac Address Table
-------------------------------------------

Vlan    Mac Address       Type        Ports
----    -----------       --------    -----
   1    c4b3.6a02.a097    DYNAMIC     Te1/0/23
   1    c4b3.6a02.a098    DYNAMIC     Te1/0/24
   6    c4b3.6a02.a08f    DYNAMIC     Te1/0/15
  97    c4b3.6a02.a090    DYNAMIC     Te1/0/16
 131    c4b3.6a02.a091    DYNAMIC     Te1/0/17
   5    c4b3.6a02.a092    DYNAMIC     Te1/0/18
 201    c4b3.6a02.a093    DYNAMIC     Te1/0/19
 200    c4b3.6a02.a094    DYNAMIC     Te1/0/20
  99    c4b3.6a02.a095    DYNAMIC     Te1/0/21
3939    c4b3.6a02.a096    DYNAMIC     Te1/0/22
Total Mac Addresses for this criterion: 10

Learning Status

This feature is deprecated.

Static MAC Addresses

Display static MAC addresses.

MAC Address Count

All MAC Address-Table Combinations

Other combinations include.

switch#show mac address-table ?                                        
  address       Address to lookup in the table
  aging-time    MAC address table aging parameters
  count         Number of MAC addresses in the table
  dynamic       List dynamic MAC addresses
  interface     List MAC adresses on a specific interface
  learning      Display learning on VLAN or interface
  move          MAC Move information
  multicast     List multicast MAC addresses
  notification  MAC notification parameters and history table
  secure        List secure MAC addresses
  static        List static MAC addresses
  vlan          List MAC addresses on a specific vlan
  |             Output modifiers
  <cr>

Managing Switching Table Sizes

General

For lower-end switches, the finite memory can be adjusted to accommodate switch roles.
This is done by changing the switch template.
Also called: SDM, or Switch Database Management.

Template Options

Template options include, but are not limited to.
- default
  - Default bias
- access
  - Access bias
- routing
  - Unicast bias
- vlan
  - VLAN bias
- dual-ipv4-and-ipv6
  - Supports IPv4 and IPv6

Display current template (on a 9300-24UX

sw-27#show sdm prefer 
Showing SDM Template Info

This is the Access template.
  Number of VLANs:                                     4094
  Unicast MAC addresses:                               32768
  Overflow Unicast MAC addresses:                      1024
  L2 Multicast entries:                                8192
  Overflow L2 Multicast entries:                       512
  L3 Multicast entries:                                8192
  Overflow L3 Multicast entries:                       512
  Directly connected routes:                           24576
  Indirect routes:                                     8192
  Security Access Control Entries:                     5120
  QoS Access Control Entries:                          5120
  Policy Based Routing ACEs:                           1024
  Netflow Input ACEs:                                  256
  Netflow Output ACEs:                                 768
  Flow SPAN ACEs:                                      1024
  Tunnels:                                             512
  LISP Instance Mapping Entries:                       2048
  Control Plane Entries:                               512
  Input Netflow flows:                                 32768
  Output Netflow flows:                                32768
  SGT/DGT (or) MPLS VPN entries:                       8192
  SGT/DGT (or) MPLS VPN Overflow entries:              512
  Wired clients:                                       2048
  MACSec SPD Entries:                                  256
  VRF:                                                 256
  MPLS Labels:                                         8192
  MPLS L3 VPN Routes VRF Mode:                         7168
  MPLS L3 VPN Routes Prefix Mode:                      8192
  MVPN MDT Tunnels:                                    256
  L2 VPN EOMPLS Attachment Circuit:                    256
  MAX VPLS Bridge Domains :                            128
  MAX VPLS Peers Per Bridge Domain:                    32
  MAX VPLS/VPWS Pseudowires :                          1024

These numbers are typical for L2 and IPv4 features.
Some features such as IPv6, use up double the entry size;
so only half as many entries can be created.

Display information about an SDM template (On a 9300-24UX).

sw-27#show sdm prefer nat 
Showing SDM Template Info

This is the NAT template.
  Number of VLANs:                                     4094
  Unicast MAC addresses:                               32768
  Overflow Unicast MAC addresses:                      1024
  L2 Multicast entries:                                8192
  Overflow L2 Multicast entries:                       512
  L3 Multicast entries:                                8192
  Overflow L3 Multicast entries:                       512
  Directly connected routes:                           24576
  Indirect routes:                                     8192
  Security Access Control Entries:                     5120
  QoS Access Control Entries:                          1024
  Policy Based Routing ACEs:                           5120
  Netflow Input ACEs:                                  256
  Netflow Output ACEs:                                 768
  Flow SPAN ACEs:                                      1024
  Tunnels:                                             512
  LISP Instance Mapping Entries:                       512
  Control Plane Entries:                               512
  Input Netflow flows:                                 32768
  Output Netflow flows:                                32768
  SGT/DGT (or) MPLS VPN entries:                       8192
  SGT/DGT (or) MPLS VPN Overflow entries:              512
  Wired clients:                                       2048
  MACSec SPD Entries:                                  256
  VRF:                                                 256
  MPLS Labels:                                         2048
  MPLS L3 VPN Routes VRF Mode:                         7168
  MPLS L3 VPN Routes Prefix Mode:                      8192
  MVPN MDT Tunnels:                                    256
  L2 VPN EOMPLS Attachment Circuit:                    256
  MAX VPLS Bridge Domains :                            128
  MAX VPLS Peers Per Bridge Domain:                    32
  MAX VPLS/VPWS Pseudowires :                          1024

These numbers are typical for L2 and IPv4 features.
Some features such as IPv6, use up double the entry size;
so only half as many entries can be created.

Activate SDM Template

The SDM template can be changed to another template by (On a 9300-24UX).

sw-27(config)#sdm prefer nat
Changes to the running SDM preferences have been stored, but cannot take effect until the next reload. Use 'show sdm prefer' to see what SDM preference is currently active.

Backlinks

CCIE-EI v1.1

Table of Contents

Managing MAC table

Aging Time

MAC Address Count

Dynamic MAC Addresses

Learning Status

Static MAC Addresses

MAC Address Count

MAC Address Count

MAC Address Count

All MAC Address-Table Combinations

Managing Switching Table Sizes

General

Template Options

Activate SDM Template

Backlinks