Cisco Cisco 2800 3800 Series 1-Port (SFP) Gigabit Ethernet High-Speed WIC Information Guide
Q&A
© 2009 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information.
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Features
Q.
Are jumbo frames supported?
A.
Yes. The maximum transmission unit (MTU) is user-configurable and can be set from 64 to 9576 bytes. The
MTU specifies the size of the Ethernet packet payload, excluding the Ethernet header.
Q.
Is Cisco EtherChannel supported?
A.
Yes. Cisco EtherChannel is supported for link redundancy, and can only be set up manually. Negotiation
protocols such as Link Aggregation Control Protocol (LACP) (802.ad) and Port Aggregation Protocol (PAgP) are
not supported.
Q.
Is flow control supported?
A.
Yes. The HWIC supports 802.3x PAUSE frames operation for transmit and receive control.
Q.
What trunking protocols are supported?
A.
Only 802.1Q is supported. Inter-Switch Link (ISL) is not supported; it is proprietary to Cisco and is not commonly
deployed.
Q.
What modes of loopback are supported?
A.
Gigabit Ethernet HWIC supports loopback at the transceiver level and the MAC controller level.
Router(config-if)#loopback ?
driver Loopback at the transceiver level
mac Loopback at the MAC controller level
<cr>
Q.
Does HWIC-1GE-SFP support 10/100BASE-T by using 1000BASE-T SFPs?
A.
No. HWIC-1GE-SFP only supports 1000 Mbps in full duplex. "Speed" or "duplex" commands are not supported
under the interface.
Application
Q.
What are possible applications of the HWIC-1GE-SFP?
A.
The HWIC-1GE-SFP is intended for:
●
Low-cost, high-speed, and long-distance connectivity for all Cisco Integrated Services routers into
metropolitan backbones
●
Gigabit Ethernet uplink for WAN gateways as an upgrade from Fast Ethernet
●
Access link between customer premises equipment (CPE) and service provider POPs; this will target metro-
area applications where Gigabit Ethernet-based services are available from service providers.
●
VLAN access trunk supporting multiple customers and multiple VLANs from the same CPE
●
High-speed short- or long-distance connectivity in the wiring closet or in the same building
●
Interoffice connectivity to avoid expensive leased lines