Datasheet

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Q. Is Auto-Negotiation supported on the two onboard Gigabit Ethernet ports?
A. The Auto-Negotiation CLI is supported on the two onboard Gigabit Ethernet ports, however, we detached the meaning of actually setting Auto-
Negotiation Capability with this CLI. We did not remove the CLI itself since there are other uses of this CLI like turning off and on the FLOW
Control. There are historical and legacy reasons NOT to remove this across all different FE/GE interfaces.
Auto Negotiation is the default configuration and could be turned on again by the following CLIs:
3845(config)#int gigabitEthernet 0/0
3845(config-if)#speed auto
3845(config-if)#duplex auto
We strongly recommend customers use Auto Negotiation, even when only one mode of operation is used (e.g., 1000Base-X full duplex). When
negotiation mode to auto, the Gigabit Ethernet port attempts to negotiate the link (that is, both port speed and duplex setting) with the partner port.
Turning off Auto Negotiation will lead to link configuration mismatches and hence link down situations.
Q. Do the on-board Gigabit Ethernet ports on the Cisco 3800 routers support jumbo frames?
A. Yes. The on-board GE ports on the Cisco 3800 routers support jumbo frame (frames up to 16351 bytes).
Cisco3825(config)#int g0/0
Cisco3825(config-if)#mtu ?
<64-16351> MTU size in bytes
Q. What VLAN trunking protocols are supported on the onboard Gigabit Ethernet interfaces?
A. The on-board Ethernet ports of the 3800 ISRs support 802.1Q VLAN trunking. They do not support Inter-Switch Link (ISL) ISL trunking.
SYSTEM POWER (AC, DC)
Q. What are the available system power supply options for the Cisco 3800 Series?
A. Both platforms come equipped with a single AC-only power supply. Optional integrated AC and IP inline power (AC-IP) and optional
DC power supplies are available for both platforms.
Q. Is RPS supported on the Cisco 3825 Integrated Services Router?
A. Yes. RPS is supported externally on the Cisco 3825 by connecting to Cisco RPS 675. The RPS connector to the external RPS unit is built into
the platform and can operate with or without the presence of a system power supply.
Q. Is there a separate SKU for RPS support on the Cisco 3825 (as there is for the Cisco 3725)?
A. No. The RPS connector is built into the platform and comes with the AC, AC-IP, or DC model of the Cisco 3825.
Q. Is RPS supported on the Cisco 3845 Integrated Services Router?
A. Yes. RPS is supported internally on the Cisco 3845 by installing another power supply in the chassis. The Cisco 3845 platform
can be configured to operate in redundant mode on two identical power supplies of AC only, AC-IP or DC only, or a mix of any two.
Q. Are there any restrictions when using these power supplies?
A. There is a restriction when using these power supplies on the Cisco 3845. You will receive one AC system power supply for every -48V DC
internal (integrated) power supply ordered for the integrated Cisco EtherSwitch module that requires inline IP phone power. This is because the -
48V DC internal (integrated) power supplies are integrated into the AC system power supply.