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15 Cards in this Set
- Front
- Back
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virtual chassis
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connect two or more EX switches together to form one unit; each switch serves as a line card or routing engine
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XRE
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external routing engine; used on EX8200 series
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NSR
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non stop routing; allows a transparent switchover between REs without requiring restart of routing protocols
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NSB
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non stop bridging; allows a transparent switchover between REs without requiring restart of L2 protocols
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VCP
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virtual chassis port; can either be a dedicated port or converted uplink port
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PFE
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packet forwarding engine; multiple PFEs in a virtual chassis are a backplane
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cabling options
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daisy-chain ring (5 m max), braided ring (22.5 m max)
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extended VC ring
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max circumference of ring is 100km; uses 1 or 10 Gb links
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mastership tie breaker
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1. member with highest priority 2. member previously function as master 3. longest uptime 4. lowest MAC 5. second member in election
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Member ID
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assigned manually or dynamically from master; preserved through reboots; serves as slot number for interface naming
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VME interface
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individual mgmt ethernet ports (me0) tied to a mgmt vlan associated with an L3 virtual mgmt interface
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NSSU
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nonstop software upgrade; used to upgrade SW on all member switches in a VC w/o disrupting traffic
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NSSU requirements
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ring topology, all members must be running same version of SW, NSR and GRES required
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GRES
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graceful routing engine switchover
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Inter-chassis packet flow
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packets always take the shortest path through a virtual chassis
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