Specifications

138 ExtremeWare XOS 11.0 Concepts Guide
Status Monitoring and Statistics
including events from the STP.InBPDU component, one excluding the event STP.CreatPortMsgFail, and
the next including the remaining events from the STP component. The severity value is shown as “*”,
indicating that the component’s default severity threshold controls which messages are passed. The
Parameter(s) heading is empty for this filter because no match is configured for this filter. Matches are
described in “Matching Expressions” next.
Each time a filter item is added to or deleted from a given filter, the specified events are compared
against the current configuration of the filter to try to logically simplify the configuration. Existing items
will be replaced by logically simpler items if the new item enables rewriting the filter. If the new item is
already included or excluded from the currently configured filter, the new item is not added to the filter.
Matching Expressions
You can configure the switch so messages reaching the target match a specified match expression. The
message text is compared with the configured match expression to determine whether to pass the
message on. To require that messages match a match expression, use the following command:
configure log target [console | memory-buffer | nvram | primary-msm | backup-msm |
session | syslog [all | <ipaddress> {vr <vr_name>} [local0 ... local7]]] match [any
|<match-expression>]
The messages reaching the target will match the match-expression, a simple regular expression. The
formatted text string that makes up the message is compared with the match expression and is passed
to the target if it matches. This command does not affect the filter in place for the target, so the match
expression is compared only with the messages that have already passed the target’s filter. For more
information on controlling the format of the messages, see “Formatting Event Messages” on page 140.
Simple Regular Expressions. A simple regular expression is a string of single characters including
the dot character (.), which are optionally combined with quantifiers and constraints. A dot matches any
single character, while other characters match only themselves (case is significant). Quantifiers include
the star character (*) that matches zero or more occurrences of the immediately preceding token.
Constraints include the caret character (^) that matches at the beginning of a message and the currency
character ($) that matches at the end of a message. Bracket expressions are not supported. There are a
number of sources available on the Internet and in various language references describing the operation
of regular expressions. Table 27 shows some examples of regular expressions.
Table 27: Simple regular expressions
Regular Expression Matches Does Not Match
port port 2:3
import cars
portable structure
poor
por
pot
..ar baar
bazaar
rebar
bar
port.*vlan port 2:3 in vlan test
add ports to vlan
port/vlan
myvlan$ delete myvlan
error in myvlan
myvlan port 2:3
ports 2:4,3:4 myvlan link down