20
en | System installation design and planning
DICENTIS
2021.01 | V2.2 |
Hardware Installation Manual
Bosch Security Systems B.V.
Switches must be configured to support DiffServ (DSCP) quality of service The switch needs
to have 4 priority queues for the DiffServ mechanism to work.
Warning:
Never use VOIP QoS settings!
Requirement
Standard
Settings
MAC table >1000
n.a.
To avoid the switch starts broadcasting unicast
packets because it runs out of space.
Disable EEE
Most implementations of EEE cause problems
because of implementation flaws. A good
implementation should work, but does not save
energy since the PTP synchronization avoids this.
Therefore, EEE (green or low power Ethernet) must
always be disabled.
Disable RSTP (when
no cable loops are
used)
Rapid Spanning Tree Protocol (RSTP) is required
when (cable) loops are created for redundancy. When
no loops are created, RSTP needs to be disabled for
optimal operation. When enabled, it can cause slow
connections to the switch.
Possibility to create
VLANS
n.a.
VLAN separation is recommended instead of IGMP
snooping, because most switches are unable to
handle the multicast changes in the system. Filtering
multicast data may be necessary for some devices,
such as 100 Mb devices (Sony cameras, TVOne, AMX,
and others).
IGMPv3 IGMPv2
snooping in
hardware
IGMPv3 or IGMPv2 snooping. To optimize bandwidth
usage, IGMP snooping can be used. This is useful in
systems with >10 multicast streams, although not
absolutely required. Sufficient performance for
handling a large number of IGMP query responses,
depends on the number of (directly or indirectly)
connected devices to that switch. Hardware support
for IGMP snooping is strongly recommended.
Requirements when
Redundant wiring is
used
Standard
Settings
RSTP
RSTP is used to allow the creation of loops for
redundancy. The switch must support changing the
following parameters to the listed values:
–
Hello_Time = 9 seconds
–
Forwarding_delay = 30 seconds
–
Max_age = 22 seconds
Diagnostics
Link Layer discovery
For network diagnoses using Network Docent.
SNMP
For network diagnoses using Network Docent.
Summary of Contents for DCNM-APS2
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