Nortel Passport 15000 Hardware Description page 279

The interfacing equipment also determines the method of sparing VSP3
cards. This section provides
• "VSP3 far-end interfacing equipment" (page 279)
• "Sparing a VSP3 at the far-end" (page 280)
VSP3 far-end interfacing equipment
When using the gigabit Ethernet ports, the ports must be cabled from the FP
faceplate to the far-end equipment. The equipment that can interface the
gigabit Ethernet ports of a VSP3 must have the following specifications for
one-for-one or one-for-n sparing.
• a router that
— transmits 1000Base-SX short wavelength laser (at 770 to 860 nm)
over multimode (MM) cable
— bridges connections
— connects other IP subnets
— has VRRP (or an equivalent protocol) for router sparing
— for example, provides both bridging and VRRP routing capabilities
within the same chassis by bridging through configured port-based
VLANs, as with a Passport 8600
• each port connected to a Layer 2 bridge to form part of an Ethernet local
area network (LAN)
• Ethernet ports of the VSP3 cards are within the same LAN (although not
necessarily to the same physical bridge)
When the VSP3 is unspared, a direct point-to-point connection to a router
which does not support bridging is possible
• each directly-connected VSP3 is placed in a separate IP subnet
• the far-end must support auto-negotiation
For an example configuration, refer to the figure "Example of spared VSP3
cards in a LAN hardware configuration" (page 282).
Chapter 4 Control and function processors 279
Passport 15000, 20000 Hardware Description 5.2S2