gtm global-settings load-balancing¶

gtm global-settings load-balancing(1) BIG-IP TMSH Manual gtm global-settings load-balancing(1)

NAME
load-balancing - Configures the load balancing settings for the Global Traffic Manager(tm).

MODULE
gtm global-settings

SYNTAX
Modify or display the load-balancing component within the gtm global-settings module using the syntax in the
following sections.

edit load-balancing
options:
all-properties
non-default-properties

DISPLAY
list
list load-balancing
show running-config load-balancing
show running-config load-balancing [option]
options:
all-properties
non-default-properties
one-line

DESCRIPTION
You can use the load-balancing component to modify or display the load balancing settings for the Global
Traffic Manager.

EXAMPLES
modify load-balancing ignore-path-ttl yes

Specifies that dynamic load balancing methods can use path data, even after the time-to-live (TTL) for the
path data expires.

list load-balancing all-properties

Displays all properties of the load balancing settings for the Global Traffic Manager.

OPTIONS
failure-rcode
Specifies the DNS RCODE used when failure-rcode-response is enabled. Default is noerror. Options include
noerror (no type exists at this name), formerr (format error in query), servfail (unable to process
query), nxdomain (name does not exist), notimpl (no support for this kind of query), and refused (refuse
to process based on policy). If failure-rcode-ttl is non-zero, only the Authority section of the noerror
or nxdomain response will include a SOA record.

failure-rcode-response
When enabled, specifies that the system returns a RCODE response to Wide IP requests after exhausting all
load-balancing methods. This affects all Wide IPs and may only be overridden by a more specific enabled
configuration of a Wide IP. This response is an authoritative empty answer from the system for record
requests. With this option enabled, the system responds faster to requests for which it does not have
viable answers configured. The default value is disabled.

failure-rcode-ttl
Specifies the negative caching TTL of the SOA for the RCODE response. The default is 0, meaning no SOA is
included (i.e. no caching).

ignore-path-ttl
Specifies, when set to yes, that dynamic load balancing methods can use path data, even after the time-
to-live (TTL) for the path data expires. The default value is no.

respect-fallback-dependency
Specifies, when set to yes, that the system accepts virtual server status when the load balancing mode
changes to the mode specified by the fallback-mode option of the pool. The default value is no.

topology-longest-match
Specifies, when set to yes, that the system evaluates all topology records in the topology statement, and
then selects the topology record that most specifically matches the IP address in an LDNS request (in
other words, has the longest match). When this option is set to no, the system selects the first record
in the topology statement that matches the request.

topology-prefer-edns0-client-subnet
Specifies, when set to enabled, that the system should use the edns0 client subnet option (if one exists)
instead of the source address when using topology load balancing. When this option is set to disabled or
if the query did not contain a client subnet option, the system will fall back to the source address.

When disabled this option can be overridden by a per wide IP setting, gtm wideip [wideip type] [wideip
name] topology-prefer-edns0-client-subnet [disabled | enabled].

verify-vs-availability
Specifies, when set to yes, that the system checks the availability of virtual servers before sending a
connection to those virtual servers. The default value is no.

SEE ALSO
edit, gtm global-settings general, gtm global-settings metrics, gtm global-settings metrics-exclusions, list,
modify, show, tmsh

COPYRIGHT
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BIG-IP 2017-09-28 gtm global-settings load-balancing(1)