Dell S4048T User Manual

During the time between the Transit node detecting that its link is restored and the Master node detecting
that the ring is restored, the Master node’s Secondary port is still forwarding traffic. This can create a
temporary loop in the topology. To prevent this, the Transit node places all the ring ports transiting the newly
restored port into a temporary blocked state. The Transit node remembers which port has been temporarily
blocked and places it into a pre- forwarding state. When the Transit node in the pre-forwarding state receives
the control frame instructing it to clear its routing table, it does so and unblocks the previously blocked ring
ports on the newly restored port. Then the Transit node returns to the Normal state.
Multiple FRRP Rings
Up to 255 rings are allowed per system and multiple rings can be run on one system.
More than the recommended number of rings may cause interface instability. You can configure multiple
rings with a single switch connection; a single ring can have multiple FRRP groups; multiple rings can be
connected with a common link.
The platform supports up to 32 rings on a system (including stacked units).
Member VLAN Spanning Two Rings Connected by One
Switch
A member VLAN can span two rings interconnected by a common switch, in a figure-eight style topology.
A switch can act as a Master node for one FRRP group and a Transit for another FRRP group, or it can be a
Transit node for both rings.
In the following example, FRRP 101 is a ring with its own Control VLAN, and FRRP 202 has its own Control
VLAN running on another ring. A Member VLAN that spans both rings is added as a Member VLAN to both
Force10 Resilient Ring Protocol (FRRP) 401

Dell S4048T Specifications

General

Switching Capacity	1.44 Tbps
Rack Units	1U
Form Factor	Rack-mountable
Power Device	Internal power supply
Power Redundancy	Optional
Product Type	Switch
Jumbo Frame Support	Yes
Routing Protocol	OSPF, BGP, RIP, VRRP, PIM-SM, IGMP
Remote Management Protocol	SNMP, RMON, Telnet, SSH
Features	Quality of Service (QoS), Jumbo Frames Support, Virtual Route Redundancy Protocol (VRRP), VLAN support, sFlow, Multiple Spanning Tree Protocol (MSTP), Rapid Spanning Tree Protocol (RSTP), IPv6 support
Compliant Standards	IEEE 802.3, IEEE 802.3u, IEEE 802.3ab, IEEE 802.3ae
Dimensions (W x D x H)	17.3 in x 16 in x 1.7 in
Operating Temperature	0°C to 40 °C
Operating Humidity	10% to 90% (non-condensing)