HP Serviceguard A.11.20- Managing Serviceguard Twentieth Edition, August 2011

But if the IP Monitor detects the failure (and link-level monitoring does not) cmviewcl -v output
will look something like this:
Network_Parameters:
INTERFACE STATUS PATH NAME
PRIMARY down (disabled) (IP only) 0/3/1/0 lan2
PRIMARY up 0/5/1/0 lan3
cmviewcl -v -f line will report the same failure like this:
node:gary|interface:lan2|status=down
node:gary|interface:lan2|local_switch_peer=lan1
node:gary|interface:lan2|disabled=true
node:gary|interface:lan2|failure_type=ip_only
In this case, you would need to re-enable the primary interface on each node after the link is
repaired, using cmmodnet (1m); for example:
cmmodnet —e lan2
Example 2: If There Is No Local Switching
If local switching is not configured and a failure is detected by link-level monitoring, output from
cmviewcl -v will look like something like this:
Network_Parameters:
INTERFACE STATUS PATH NAME
PRIMARY down (Link and IP) 0/3/1/0 lan2
PRIMARY up 0/5/1/0 lan3
cmviewcl -v -f line will report the same failure like this:
node:gary|interface:lan2|status=down
node:gary|interface:lan2|disabled=false
node:gary|interface:lan2|failure_type=link+ip
If local switching is not configured and a failure is detected by IP monitoring, output from cmviewcl
-v will look like something like this:
Network_Parameters:
INTERFACE STATUS PATH NAME
PRIMARY down (IP only) 0/3/1/0 lan2
PRIMARY up 0/5/1/0 lan3
cmviewcl -v -f line will report the same failure like this:
node:gary|interface:lan2|status=down
node:gary|interface:lan2|disabled=false
node:gary|interface:lan2|failure_type=ip_only
Automatic Port Aggregation
Serviceguard supports the use of automatic port aggregation through HP-APA (Auto-Port
Aggregation, HP product J4240AA). HP-APA is a networking technology that aggregates multiple
physical Fast Ethernet or multiple physical Gigabit Ethernet ports into a logical link aggregate.
HP-APA allows a flexible, scalable bandwidth based on multiple 100 Mbps Fast Ethernet links or
multiple 1 Gbps Ethernet links (or 200 Mbps and 2 Gbps full duplex respectively). Its other benefits
include load balancing between physical links, automatic fault detection, and recovery for
environments which require high availability. Port aggregation capability is sometimes referred to
as link aggregation or trunking. APA is also supported on dual-stack kernel.
Once enabled, each link aggregate can be viewed as a single logical link of multiple physical
ports with only one IP and MAC address. HP-APA can aggregate up to 32 physical ports into one
link aggregate; the number of link aggregates allowed per system is 50. Empty link aggregates
will have zero MAC addresses.
You can aggregate the ports within a multi-ported networking card. Alternatively, you can aggregate
ports from different cards. Figure 28 shows two examples.
How the Network Manager Works 77