Juniper ACX1000 Configuration Manual page 191

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Number of bridge domains associated with each ring instance
Number of forwarding database entries associated with each bridge domain
The ERPS control packets are copied to the CPU (Ethernet ring control module) only
when the VLAN ID and destination address of the packet matches with the values of
the RAPS message. Otherwise, the control packet is treated as a regular service frame
and forwarded accordingly. The packets that are copied to the CPU are queued in the
specified CPU queue, which is rate-limited. This mechanism ensures that a possible
Denial-of-Service (DoS) attack does not significantly impact the system. If a DoS
attack is detected, a firewall filter on the affected logical interfaces can be configured
in the bridge domain.
For fast detection required for switchover within 50 milliseconds, we recommend that
you configure connectivity fault management (CFM) link-level MEPs with an interval
of 10 milliseconds for the duration between the transmission of CFM messages. This
link-level MEP can be used to trigger switchovers for all ring instances that share a
physical ring.
Forwarding and flush mechanisms are common for STP and ERP.
We recommend that you configure link-level maintenance association endpoints
(MEPs) with 10ms on physical interfaces. If link-level MEPs are not configured on
physical interfaces, fast switching (less than 100ms) might not occur.
The maximum number of physical rings supported on different ACX Series routers is
as follows:
4 physical rings on ACX1000, ACX1100, ACX2000, and ACX2100 routers
8 physical rings on ACX4000 routers
24 physical rings on ACX5048 and ACX5096 routers
The maximum number of ring instances supported on different ACX Series routers is
as follows:
8 ring instances on ACX1000, ACX1100, ACX2000, and ACX2100 routers
16 ring instances on ACX4000 routers
96 ring instances on ACX5048 and ACX5096 routers
Ethernet Ring Protection Switching Overview on page 111
Configuring Ethernet Ring Protection Switching on page 118
Chapter 4: Configuring Interfaces and Chassis
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