What is load balancing in EtherChannel?
EtherChannel Load-Balancing Options. EtherChannel load balances traffic across links in the bundle. However, traffic is not necessarily distributed equally among all the links. Frames are forwarded over an EtherChannel link that is based on results of a hashing algorithm.
How does LACP load balance?
Load Balancing in LACP Mode To prevent out-of-order packets, Eth-Trunk uses flow-based load balancing. This mechanism uses the hash algorithm to calculate the address in a data frame and generate a hash key based on which the system searches for the outbound interface in the Eth-Trunk forwarding table.
How many links can one EtherChannel have?
EtherChannel is a port link aggregation technology in which multiple physical port links are grouped into one logical link. It is used to provide high-speed links and redundancy. A maximum of 8 links can be aggregated to form a single logical link.
How does OSPF load balancing Work?
If equal-cost paths exist to the same destination, the Cisco implementation of OSPF can keep track of up to 16 next hops to the same destination in the routing table (which is called load balancing). By default, the Cisco router supports up to four equal-cost paths to a destination for OSPF.
What is difference between PAGP and LACP in EtherChannel?
Both LACP and PAGP packets are exchanged between switches over Etherchannel capable ports. The most significant difference is the vendors supported for them. LACP is open standard and supported by most of vendors, while PAGP is Cisco proprietary only used between Cisco devices.
What is the maximum number of interfaces that can be aggregated with EtherChannel?
Each EtherChannel can consist of up to eight compatibly configured Ethernet ports. All ports in each EtherChannel must be configured as either Layer 2 or Layer 3 ports. The number of EtherChannels is limited to 48.
What is the maximum number of ports supported for virtual switch links?
The virtual switching system supports a maximum of 128 EtherChannels on one VSS.
Does OSPF automatically load balance?
OSPF load balances across equal cost paths to the same destination by default. If the destination is connected to R1 then R2 will never load balance across the direct path to R1 and the indirect path through R3 because they are not equal cost.
How many etherchannels does a catalyst 4500/4000 series Switch support?
A Catalyst 4500/4000 series switch with Cisco IOS Software (Supervisor Engine II+ and later) supports a maximum of 64 EtherChannels. You can form an EtherChannel with up to eight compatibly configured Ethernet interfaces on any module and across modules.
What does the information in the document apply to all etherchannels?
The information in the document applies to all of these EtherChannels. This document presents the concept of load balancing and redundancy on Cisco Catalyst switches with the use of the EtherChannel. This document also covers the Port Aggregation Protocol (PAgP) and trunking support over EtherChannel.
How do I configure etherchannels?
You can configure EtherChannels manually, use the Port Aggregation Control Protocol (PAgP) or, with Cisco IOS Release 12.2(25)EWA and later, the Link Aggregation Control Protocol (LACP) to form EtherChannels. The EtherChannel protocols allow ports with similar characteristics to form an
What port numbers can be used for load balancing on EtherChannel?
EtherChannel load balancing can use MAC addresses, IP addresses, or Layer 4 port numbers with a Policy Feature Card 2 (PFC2) and either source mode, destination mode, or both. The mode you select applies to all EtherChannels that you configure on the switch.