Restrictions For Configuring Ieee 802.3Ad Link Bundling - Cisco ASR 920 Series Configuration Manual Ethernet Router

Restrictions for Configuring IEEE 802.3ad Link Bundling

Restrictions for Configuring IEEE 802.3ad Link Bundling
• The maximum number of Ethernet links per bundle that can be supported varies by platform. Some
• All links must operate at the same link speed and in full-duplex mode (LACP does not support half-duplex
• All links must be configured as either EtherChannel links or LACP links.
• Only physical interfaces can form aggregations. Aggregations of VLAN interfaces are not possible nor
• If a router is connected to a switch, the bundle terminates on the switch.
• An EtherChannel will not form if one of the LAN ports is a Switched Port Analyzer (SPAN) destination
• All ports in an EtherChannel must use the same EtherChannel protocol.
• Maximum of four bundled ports per Ethernet port channel are supported.
• The maximum number of bundled ports per Ethernet port channel that can be supported varies by
• Maximum of 64 Ethernet port channels in a chassis are supported.
• Quality of service (QoS) is supported on individual bundled ports and not on Ethernet port channels.
Information About Configuring IEEE 802.3ad Link Bundling
Gigabit EtherChannel
Gigabit EtherChannel (GEC) is high-performance Ethernet technology that provides Gigabit per second (Gb/s)
transmission rates. A Gigabit EtherChannel bundles individual Ethernet links (Gigabit Ethernet or Ten Gigabit
Ethernet) into a single logical link that provides the aggregate bandwidth of up to eight physical links. All
LAN ports in each EtherChannel must be the same speed and all must be configured as either Layer 2 or Layer
3 LAN ports. Inbound broadcast and multicast packets on one link in an EtherChannel are blocked from
returning on any other link in the EtherChannel.
When a link within an EtherChannel fails, traffic previously carried over the failed link switches to the
remaining links within that EtherChannel. Also when a failure occurs, a trap is sent that identifies the device,
the EtherChannel, and the failed link.
Port-Channel and LACP-Enabled Interfaces
Each EtherChannel has a numbered port-channel interface that must be manually created before interfaces
can be added to the channel group. The configuration of a port-channel interface affects all LAN ports assigned
to that port-channel interface.
Carrier Ethernet Configuration Guide (Cisco ASR 920 Series)
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platforms support 4 while other platforms support a maximum 8.
mode).
is an aggregation of aggregations.
port.
platform. Some platforms support 4 while other platforms support 16.
Configuring IEEE 802.3ad Link Bundling