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Link aggregation addresses two problems with Ethernet connections: bandwidth limitations and lack of resilience.
With regard to the first issue: bandwidth requirements do not scale linearly. Ethernet bandwidths historically have increased by an order of magnitude each generation: 10 Megabit/s, 100 Mbit/s, 1000 Mbit/s, 10,000 Mbit/s. If one started to bump into bandwidth ceilings, then the only option was to move to the next generation which could be cost prohibitive. An alternative solution, introduced by many of the network manufacturers in the early 1990s, is to combine two physical Ethernet links into one logical link via channel bonding. Most of these solutions required manual configuration and identical equipment on both sides of the aggregation.
The second problem involves the three single points of failure in a typical port-cable-port connection. In either the usual computer-to-switch or in a switch-to-switch configuration, the cable itself or either of the ports the cable is plugged into can fail. Multiple physical connections can be made, but many of the higher level protocols were not designed to failover completely seamlessly.
How to configure them between cisco 4506 and huawei S5700 like this
| Cisco4506#sh int port-channel 1
Port-channel1 is up, line protocol is up (connected)
Hardware is EtherChannel, address is 8843.7a1c.55ab (bia 8843.7a1c.55ab)
Description: Etherchannel to Huawei_s5700
MTU 1500 bytes, BW 2000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
input flow-control is off, output flow-control is on
Members in this channel: Gi1/47 Gi1/48
[Quidway]display interface eth-trunk 1
Eth-Trunk1 current state : UP
Description:HUAWEI, Quidway Series, Eth-Trunk1 Interface
Switch Port,PVID : 1,Hash arithmetic : According to SIP-XOR-DIP,The Maximum Frame Length is 9216
Internet protocol processing : disabled
IP Sending Frames’ Format is PKTFMT_ETHNT_2, Hardware address is 781d-bad1-212a
PortName Status Weight
GigabitEthernet1/0/47 UP 1
GigabitEthernet1/0/48 UP 1
The Number of Ports in Trunk : 2
The Number of UP Ports in Trunk : 2