Logical Bypass and Physical Bypass

Logical bypass lets traffic bypass the inline tool should it experience a failure. A failure is declared if the GigaVUE node either loses connectivity to the inline tool or fails to receive a heartbeat from the tool.

Logical inline bypass does not require any specialized hardware and can be facilitated on regular ports on GigaVUE‑HC3, and GigaVUE‑HC1 modules. On GigaVUE‑HC1, logical inline bypass can be configured on the base module.

Physical bypass provides protection against failure of the GigaVUE node, such as if power is lost. On GigaVUE® HC Series nodes, it is implemented with specialized hardware called bypass combo modules.

The specialized hardware triggers a bypass when power is lost to the node. When the physical bypass is activated, traffic flows from one side of the network to the other, but without monitoring.

The GigaVUE‑HC3 bypass combo module is a bypass switch (BPS) module, as follows:

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Bypass Combo Module with two 100Gb/40Gb SR4 MPO inline network port pairs and sixteen regular SFP+ (10Gb) port cages (BPS-HC3-C25F2G)

The GigaVUE‑HC1 bypass combo module is a bypass switch (BPS) module, as follows:

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Bypass Combo Module with two SX/SR (50/125μm multimode) inline network port pairs and four regular SFP+ (1Gb/10Gb) port cages (BPS-HC1-D25A24)

Physical bypass is also supported on the following copper TAP modules on GigaVUE‑HC1:

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On the GigaVUE‑HC1 copper TAP module, TAP-HC1-G10040

The GigaVUE‑HC3, and GigaVUE‑HC1 offer physical and logical inline bypass. Physical bypass provides automatic failover protection in the case of a power failure. On the GigaVUE HC Series nodes, the bypass combo modules provide the physical bypass function. Or on GigaVUE‑HC1, the copper TAP modules provide the physical bypass function.

The physical bypass function, as it applies to a single pair of inline network ports, is as follows:

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When the module is not powered, (either the entire node is powered down or the module is removed from the node), the inline network port pair is in the physical bypass mode. That means that traffic is exchanged directly between network Port A and network Port B of the inline network pair.

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When the module is powered, the mode (inline or bypass) of the inline network port pair is controlled through software. In the physical bypass mode, the inline network port pair behaves exactly as if the module was not powered. In the inline mode, the inline network port pair behaves as any other inline network port pair configured for working with an inline tool.

For information on the bypass combo module on GigaVUE‑HC3, refer to the GigaVUE-HC3 Hardware Installation Guide. This document also contains procedures for installing, removing, and replacing modules in the GigaVUE‑HC3.

For information on the bypass combo module or the TAP-HC1-G10040 module on GigaVUE‑HC1, refer to the GigaVUE-HC1 Hardware Installation Guide. This document also contains procedures for installing, removing, and replacing modules in the GigaVUE‑HC1.

Refer also to 1 and Protected Inline Network.

Physical Bypass Protection