May 2011
Intermediate to advanced
788 pages
23h 34m
English
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Configuring VLANs
VLANs are typically configured via the CatOS or IOS command-line
interpreter (CLI), like any other feature. However, some IOS models, such
as the 2950 and 3550 switches, have a configurable VLAN
database with its own configuration mode and commands. This can
be a challenge for the uninitiated, especially because the configuration
for this database is completely separate from the configuration for the
rest of the switch. Even a write erase
followed by a reload will not clear the
VLAN database on these switches. Configuring through the VLAN database is
a throwback to older models that offered no other way to manage VLANs.
Luckily, all newer switches (including those with a VLAN database) offer
the option of configuring the VLANs through the normal IOS CLI. Switches
like the 6500, when running in native IOS mode, only support IOS commands
for switch configuration. The Nexus line does not have a configurable VLAN
database.
Note
Cisco recommends that you configure the VLAN Trunking Protocol (VTP) as a first step when configuring VLANs. This idea has merit, as trunks will not negotiate without a VTP domain. However, setting a VTP domain is not required to make VLANs function on a single switch. Configuring VTP is covered later (see Chapter 5, Trunking and Chapter 6, VLAN Trunking Protocol).
CatOS
For CatOS, create a VLAN with the set vlan
command:
Switch1-CatOS# (enable)set vlan 10 name Lab-VLAN VTP advertisements transmitting temporarily stopped, and will resume after the ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.