Technical data

ServerIron Switching and Routing Guide
2 - 2 © 2012 Brocade Communications Systems, Inc. May 2012
By default, all ports in a Brocade device belong to a common Layer 2 broadcast domain, VLAN 1. You can
configure port-based VLANs (Virtual LANs) to create smaller broadcast domains that use subsets of the device’s
ports.
Static MAC Entries
MAC entries that the Brocade device learns and caches are subject to an aging time. After a cached entry
remains unused for the duration of the aging time, the software removes the entry from the Layer 2 cache. If you
want certain MAC addresses to always be present in the device’s Layer 2 address table, you can add them as
static entries.
A static MAC entry, like a cached (dynamic) MAC entry, maps a MAC address to the Brocade device’s port
attached to that device.
Unlike cached MAC entries, static MAC entries provide the following benefits:
• You can assign a QoS priority to a static MAC entry.
• You can specify VLAN membership for a static MAC entry.
• A static entry prevents broadcast storms that can be caused when a server’s MAC entry is removed. For
example, if a server goes down long enough for the server’s entry to age out, the Brocade device sends
packets addressed to the server as broadcasts until the device relearns the cache entry for the server.
You can specify port priority (QoS) and VLAN membership (VLAN ID) for the MAC address. On switches, you also
can specify the device type (router or host) for the entry.
NOTE: On Brocade routers, you also can create static IP routes, ARP entries, and RARP entries. The
ServerIron and other Brocade switches support only static MAC addresses.
Displaying MAC Addresses
To display all MAC addresses on a ServerIron, enter the following:
ServerIron(config)# show mac-address
Total entries from all ports = 75
MAC Port Age CamF CIDX0 CIDX1 CIDX2 CIDX3 CIDX4 CIDX5
0000.0300.0000 10 17293 00H 0 0 0 0 0 0
0060.089f.8086 1 12 0bH 23 15 0 6 0 0
0060.9709.914b 16 2130 00H 0 0 0 0 0 0
00a0.249a.0163 16 130 00H 0 0 0 0 0 0
0060.979d.41a5 11 475 00H 0 0 0 0 0 0
00a0.24c5.01d1 11 0 0cH 0 0 20 14 0 0
0060.979d.41df 11 570 00H 0 0 0 0 0 0
0060.9759.4226 16 240 00H 0 0 0 0 0 0
0060.9759.4235 16 130 00H 0 0 0 0 0 0
0800.208f.725b 2 135 00H 0 0 0 0 0 0
0060.9759.4264 16 0 0aH 0 14 0 21 0 0
00a0.24c5.02a1 16 15 09H 5 0 0 33 0 0
0000.c02c.a2bf 7 11 03H 27 5 0 0 0 0
00a0.24c5.02f8 4 135 00H 0 0 0 0 0 0
00a0.24c5.02fc 6 0 06H 0 8 31 0 0 0
0800.207e.c312 2 2 0dH 25 0 24 13 0 0
0800.208f.5331 2 135 00H 0 0 0 0 0 0
00e0.5200.0385 10 5160 00H 0 0 0 0 0 0
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