DATA SHEET - SUMMIT
®
400
High availability is a critical feature of the Summit 400 because
Extreme Networks understands that availability is critical to end user
productivity. Advanced availability features normally found only on
more expensive core switches are now standard on the Summit 400.
Features such as hardware redundancy that keep the switch up and
running are combined with advanced ExtremeWare availability
software to dynamically route around problems in the network ensuring
that the end user is not only connected, but remains productive.
External Power System
Extreme Networks has long been a leader in providing redundant
power at the edge, but the Summit 400 takes this feature to a new
level. Extreme offers an External Power System that supports multiple
Summit 400 switches, all with full power simultaneously. This power
system provides 1-for-1 power for every Summit 400 connected. No
more worrying about inadequate power if more than a single switch
fails; the External Power System provides full redundant power for
every Summit 400 switch. The External Power System automatically
senses when the internal power supply has failed and immediately
provides redundant power to the switch, preventing any loss of data.
High Availability Uplinks
The Summit 400 supports redundant copper and/or fiber Gigabit
Ethernet uplinks and redundant 10 Gigabit Ethernet uplinks for not
only the highest uplink capacity at the edge, but also the greatest
redundancy. If any single uplink port is not available, the Summit 400
can automatically failover to the redundant port for maximum resiliency
and connectivity. The result is true high availability--the user stays
connected to the network and remains productive.
EAPS–Sub-Second Layer 2 Resiliency
The Summit 400 supports EAPS (RFC 3619) to deliver sub-second
(less than 50 msec recovery) protection switching to Layer 2 switches
interconnected in an Ethernet ring topology. EAPS is similar to the
Spanning Tree Protocol (STP), but offers the advantage of converging
in significantly less time than STP or even Rapid Spanning Tree
(802.1w) when a link breaks in the ring. 50 msec convergence times
are invisible to routing protocols so the routing protocols don’t need to
re-converge. Voice-over-IP (VoIP) calls don’t drop and video feeds
don’t flicker because EAPS enables the users to stay connected even
when there are link failures in the upstream network.
Software Enhanced Availability
The Summit 400 uses advanced Layer 3 availability intelligence to
route around problems in the upstream network so that even if part
of the network infrastructure is down, users remain connected to the
network and productive. Using advanced Layer 3 protocols like
OSPF and ESRP, the Summit 400 constantly checks for breaks in
the uplink connections and dynamically routes around the problem.
Network administrators can now create non-stop routing topologies
that combine with switch hardware redundancy to deliver the
highest level of availability.
Page 7
High Availability to Keep Users Connected
and Productive
• EAPS (RFC 3619) enables subsecond failover if ring is disrupted
• Summit 400 can be an EAPS transit or master node, but cannot
interconnect 2 rings
• EAPS 50 millisecond failover is substantially faster than 802.1D
(Spanning Tree Protocol, up to 45 seconds to reconverge) and 802.1w
(Rapid Spanning Tree)
Summit 400 EAPS Node
Summit 400 EAPS Node
Summit 400 EAPS Node
EAPS Master
External Power System with 2 EPS-160 Power Supplies
Summit 400 EAPS Supports the industry-fastest
Layer 2 failover
(8 paginas)
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