Port Aggregation

1
Port Aggregation Load Balancing

• By
• Joe B., Nabeel O.
• Miguel Mufaddal J.

2
Objectives

• Switch Configuration
• Port Aggregatioon
• Port Channels
• Fast Etherchannels
• Load Balancing

3
Etherchannels

• The EtherChannel provides full-duplex bandwidth
  up to 800 Mbps (Fast EtherChannel) or 2 Gbps
  (Gigabit EtherChannel) between your switch and
  another switch or host.
• Each EtherChannel can consist of up to eight
  compatibly configured Ethernet interfaces. All
  interfaces in each EtherChannel must be the same
  speed, and all must be configured as Layer 2
  interfaces.

4
Port Channels

• EtherChannel consists of individual Fast Ethernet
  or Gigabit Ethernet links bundled into a single
  logical link

5
EtherChannel Modes

• Auto Places an interface into a passive
  negotiating state, in which the interface
  responds to PAgP packets it receives but does not
  initiate PAgP packet negotiation. This setting
  minimizes the transmission of PAgP packets.
• Desirable Places an interface into an active
  negotiating state, in which the interface
  initiates negotiations with other interfaces by
  sending PAgP packets.
• On Forces the interface to channel without PAgP.
  With the on mode, a usable EtherChannel exists
  only when an interface group in the on mode is
  connected to another interface group in the on
  mode.

6
Switch Configuration

• Switchconfig t
• Switch(config)int fa 0/7
• Switch(config-if)channel-group 1 mode desirable
• Creating a port-channel interface Port-channel 1
• Switch(config-if)exit
• Switch(config)int fa 0/8
• Switch(config-if)channel-group 1 mode desirable
• Switch(config-if)exit
• Switch(config)int fa 0/9
• Switch(config-if)channel-group 1 mode desirable
• Switch(config-if)exit

7
Switch Configuration

• Switchsh run
• Building configuration...
• Current configuration 1531 bytes
• !
• version 12.1
• no service single-slot-reload-enable
• no service pad
• service timestamps debug uptime
• service timestamps log uptime
• no service password-encryption
• ! hostname Switch
• !
• !
• ip subnet-zero
• !
• spanning-tree extend system-id
• !
• !
• interface Port-channel1

• !
• interface FastEthernet0/2
• no ip address
• !
• interface FastEthernet0/7
• no ip address
• channel-group 1 mode desirable
• !
• interface FastEthernet0/8
• no ip address
• channel-group 1 mode desirable
• !
• interface FastEthernet0/9
• no ip address
• channel-group 1 mode desirable
• !
• interface FastEthernet0/10
• no ip address
• !......................................

8
Switch Config. (Cont.)

• interface Vlan1
• no ip address
• no ip route-cache
• shutdown
• !
• ip http server
• !
• !
• line con 0
• line vty 5 15
• !
• End
• Switchconfig t
• Switch(config)port-channel load-balance dst-mac
• Switch(config)end
• Switchshow etherchannel l
• Destination MAC address

9
Channel-Group

• Each EtherChannel has a logical port-channel
  interface numbered from 1 to 6.

10
Load Distribution and Forwarding Methods 
11
Default EtherChannel Configuration

• Channel groups None assigned.
• PAgP mode No default.
• PAgP learn method Aggregate-port learning on
  all interfaces.
• PAgP priority 128 on all interfaces. (Changing
  this value on Catalyst 2950 switches has no
  effect.)
• Load balancing Load distribution on the switch
  is based on the source-MAC address of the
  incoming packet.

12
Configuring EtherChannels

• Configure Layer 2 EtherChannels by configuring
  the Ethernet interfaces with the channel-group
  interface configuration command, which creates
  the port-channel logical interface.
• Note   Layer 2 interfaces must be connected and
  functioning for IOS to create port-channel
  interfaces

13
Configuring EtherChannels

• Step 1 configure terminal
• Step 2 interface interface-id

• 1) Enter global configuration mode
• 2) Enter interface configuration mode, and
  specify a physical interface to configure.
• Valid interfaces include physical interfaces.
• Up to eight interfaces of the same type and speed
  can be configured for the same group.

14
Configuring EtherChannels

• Step 3 channel-group channel-group-number mode
  auto non-silent desirable non-silent on
• Step 4 end

• 3) Assign the interface to a channel group, and
  specify the PAgP mode. The default mode is auto
  silent.
• For channel-group-number, the range is 1 to 6.
  Each EtherChannel can have up to eight compatibly
  configured Ethernet interfaces.
• 4) Return to privileged EXEC mode

15
Configuring EtherChannels

• Step 5 show running-config
• Step 6 copy running-config startup-config
• To remove an interface from the EtherChannel
  group, use the no channel-group interface
  configuration command

• 5) Verify your entries.
• 6) (Optional) Save your entries in the
  configuration file.

16
Configuring EtherChannel Load Balancing

• This section describes how to configure
  EtherChannel load balancing by using source-based
  or destination-based forwarding methods
• Beginning in privileged EXEC mode to configure
  EtherChannel load balancing

17
Configuring EtherChannel Load Balancing

• Step 1 configure terminal
• Step 2 port-channel load-balance dst-mac
  -mac
• Step 3 end
• Step 4 show etherchannel load-balance
• Step 5 copy running-config startup-config
• To return EtherChannel load balancing to the
  default configuration, use the no port-channel
  load-balance global configuration command.

• 1) Enter global configuration mode.
• 2) Configure an EtherChannel load-balancing
  method.
• The default is -mac.
• 3) Return to privileged EXEC mode
• 4) Verify your entries
• 5) (Optional) Save your entries in the
  configuration file.

18
Commands for Displaying EtherChannel and PAgP
Status

• show etherchannel channel-group-number brief
  detail load-balance port port-channel
  summary
• show pagp channel-group-number counters
  internal neighbor

• Displays EtherChannel information in a brief,
  detailed, and one-line summary form. Also
  displays the load-balance or frame-distribution
  scheme, port, and port-channel information.
• Displays PAgP information such as traffic
  information, the internal PAgP configuration, and
  neighbor information

19
Little Intro.

• Cisco Cluster Management Suite
• cisco_cms