MAC Accounting
Enabling MAC Accounting on a Device
By default, MAC accounting is disabled on the device. You can enable packet accounting either for a device as a whole or for a specific VLAN. After you enable packet accounting, the Junos OS maintains packet counters for each MAC address learned.
To enable MAC accounting, include the global-mac-statistics statement at the [edit protocols l2-learning] hierarchy
level:
[edit protocols l2-learning] global-mac-statistics;
Enabling MAC Accounting for a VLAN
By default, MAC accounting is disabled. You can enable packet counting for a VLAN. When you enable packet accounting, the Junos OS maintains packet counters for each MAC address learned on the interfaces in the VLAN.
To enable MAC accounting for a VLAN, include the mac-statistics statement at the [edit vlans vlan-name switch-options] hierarchy level:
[edit vlans vlan-name switch-options] mac-statistics;
Enabling MAC Accounting for a Set of VLANs
By default, MAC accounting is disabled. You can enable packet counting for a set of VLANs. After you enable packet accounting, the Junos OS maintains packet counters for each MAC address learned on the trunk port associated with the set of VLANs.
To enable MAC accounting for a set of VLANs, include
the mac-statistics statement at the [edit switch-options] hierarchy level:
[edit switch-options] mac-statistics;
Verifying That MAC Accounting Is Working
Purpose
Verify that MAC accounting is enabled and the system is counting packets and collecting statistics.
Action
Verify that MAC accounting is enabled.
user@switch> show ethernet-switching table MAC flags (S - static MAC, D - dynamic MAC, L - locally learned SE - statistics enabled, NM - non configured MAC, R - remote PE MAC) Routing instance : default-switch Vlan MAC MAC Age Logical name address flags interface VLAN101 88:e0:f3:bb:07:f0 D,SE - ae20.0 MAC flags (S - static MAC, D - dynamic MAC, L - locally learned SE - statistics enabled, NM - non configured MAC, R - remote PE MAC) Routing instance : default-switch Vlan MAC MAC Age Logical name address flags interface VLAN102 88:e0:f3:bb:07:f0 D,SE - ae20.0 MAC flags (S - static MAC, D - dynamic MAC, L - locally learned SE - statistics enabled, NM - non configured MAC, R - remote PE MAC) Routing instance : default-switch Vlan MAC MAC Age Logical name address flags interface VLAN103 88:e0:f3:bb:07:f0 D,SE - ae20.0 [...output truncated...]Display MAC accounting statistics for all VLANs associated with an interface.
user@switch> show ethernet-switching statistics Local interface: ae20.0, Index: 1039 Broadcast packets: 115 Broadcast bytes : 6900 Multicast packets: 395113 Multicast bytes : 61622869 Flooded packets : 0 Flooded bytes : 0 Unicast packets : 1419 Unicast bytes : 117924 Current MAC count: 4 (Limit 8192) [...output truncated...]
Display MAC accounting statistics for each address in the MAC address table.
user@switch> show ethernet-switching table extensive MAC address: 88:e0:f3:bb:07:f0 Routing instance: default-switch VLAN ID: 101 Learning interface: ae20.0 Layer 2 flags: in_hash,in_ifd,in_ifl,in_vlan,in_rtt,acct,kernel,in_ifbd Epoch: 6 Sequence number: 13 Learning mask: 0x00000020 MAC address used as destination: Packet count: 0 Byte count: 0 MAC address used as source: Packet count: 9 Byte count: 1116 MAC address: 88:e0:f3:bb:07:f0 Routing instance: default-switch VLAN ID: 102 Learning interface: ae20.0 Layer 2 flags: in_hash,in_ifd,in_ifl,in_vlan,in_rtt,acct,kernel,in_ifbd Epoch: 6 Sequence number: 13 Learning mask: 0x00000020 MAC address used as destination: Packet count: 0 Byte count: 0 MAC address used as source: Packet count: 9 Byte count: 1116 MAC address: 88:e0:f3:bb:07:f0 Routing instance: default-switch VLAN ID: 103 Learning interface: ae20/0 Layer 2 flags: in_hash,in_ifd,in_ifl,in_vlan,in_rtt,acct,kernel,in_ifbd Epoch: 6 Sequence number: 13 Learning mask: 0x00000020 MAC address used as destination: Packet count: 0 Byte count: 0 MAC address used as source: Packet count: 9 Byte count: 1116 [...output truncated...]
Meaning
In the output for show ethernet-switching table, the MAC flag SE indicates that MAC accounting is enabled
for VLANs 101, 102, and 103, which are all associated with the default-switch routing instance.
The output for show ethernet-switching statistics displays packet statistics and the current number of MAC addresses
learned by the VLANs associated with aggregated Ethernet interface ae20.0.
The output for show ethernet-switching table extensive shows information for each address in the MAC address table. In
particular, it displays the number of packets sent to and received
by an interface, which is identified by a MAC address.
The output from the three commands demonstrates that MAC accounting
is working properly. That is, MAC accounting is enabled on VLANs 101,
102, and 103, and as a result, you can view statistics for each of
these VLANs, aggregated Ethernet interface ae20.0, and
each MAC address.