IBM z13s, Technical Manual

Page: 306 / 588

278
IBM z13s Technical Guide
7.3.58 Link aggregation support for z/VM
Link aggregation (IEEE 802.3ad) that is controlled by the z/VM Virtual Switch (VSWITCH)
allows the dedication of an OSA-Express5S or OSA-Express4S port to the z/VM operating
system. The port must be part of an aggregated group that is configured in Layer 2 mode.
Link aggregation (trunking) combines multiple physical OSA-Express5S or OSA-Express4S
ports into a single logical link. This configuration increases throughput, and provides
nondisruptive failover if a port becomes unavailable. The target links for aggregation must be
of the same type.
Link aggregation is applicable to CHPID type OSD (QDIO). Link aggregation is supported by
z/VM V6R2 and later.
7.3.59 Multi-VSwitch Link Aggregation
Multi-VSwitch Link Aggregation support allows a port group of OSA-Express features to span
multiple virtual switches within a single z/VM system or between multiple z/VM systems.
Sharing a Link Aggregation Port Group (LAG) with multiple virtual switches increases
optimization and utilization of the OSA Express when handling larger traffic loads. Higher
adapter utilization protects customer investments, which is increasingly important as 10 Gb
deployments become more prevalent.
The minimum support requirements are listed in Table 7-49.
Table 7-49 Minimum support requirements for Multi-VSwitch Link Aggregation
7.3.60 QDIO data connection isolation for z/VM
The QDIO data connection isolation function provides a higher level of security when sharing
an OSA connection in z/VM environments that use VSWITCH. The VSWITCH is a virtual
network device that provides switching between OSA connections and the connected guest
systems.
QDIO data connection isolation allows disabling internal routing for each QDIO connected. It
also allows creating security zones and preventing network traffic between the zones. It is
supported by all OSA-Express5S and OSA-Express4S features on z13s and zBC12.
7.3.61 QDIO interface isolation for z/OS
Some environments require strict controls for routing data traffic between servers or nodes. In
certain cases, the LPAR-to-LPAR capability of a shared OSA connection can prevent such
controls from being enforced. With interface isolation, internal routing can be controlled on an
LPAR basis. When interface isolation is enabled, the OSA discards any packets that are
destined for a z/OS LPAR that is registered in the OSA Address Table (OAT) as isolated.
QDIO interface isolation is supported by Communications Server for z/OS V1R12 or later, and
all OSA-Express5S and OSA-Express4S features on z13s.
Operating system Support requirements
z/VM z/VM V6R3
a
a. PTF support is required.