Cisco Network part 39 pptx
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Bài Vi
ế
t V
ề
EtherChannel
Tác giả Lê Văn Cương
Giới Thiệu Về EtherChannel
Mục đích:
Đo các đường trunk giữa các Switch thường có băng thông không dủ lớn đo
đó khôn đáp ứng được nhu cầu ở bên trong mạng dể gây ra nghẽn do đó mà
ngườI ta sử dụng etherchannel để ghép nhiều đường trunk lạI thành một
đường để tăng dung lượng, thứ hai là đốI v
ớI các server có nhu cầu truy nhập
cao do đó cũng cần một lư
ợng băng thông lớn để tránh nghẻn, để ta sử ta cũng
sử dụng etherchannel
Nguyên tắc phân phối tải qua etherchannel:
Việc phân phối tải qua các đường của một bundle(etherchannel) được thực
hiện theo thuật toán hashing: Thuật toán này có thể sử dụng : Địa chỉ IP
nguồn, đích; Hoặc địa chỉ MAC nguồn, dích, hoặc có thể sử dụng TCP/UDP
port.
- Nếu chỉ sử dụng một địa chỉ hay một port thì việc truyền tải
qua port này hay port khác được thực hiện dựa vào các bit cuối
cùng, và phụ thuộc vào số port của etherchannel
- Nếu sử dụng cả địch, và nguồn thì thuật toán này được thực
hiện nhờ phép toán XOR các bit cuối của địa chỉ.
Các lệnh cơ bản để cấu hình Ethechannel
- Cấu hình PAGP Ethechannel:
Switch(config-if)#channel-protocol pagp
Switch(config-if)#channel-group number mode {on | auto | desirable
}
- Các mode:
- ON mode: ở mode này thì Switch tự động enale
etherchannel tuy nhiên nó lại không gởI hay nhận bất kỳ
gói PAGP nào, do đó mà phải cấu hình on mode ở hai
dầu
- Auto mode: Nó sẻ tự động enable ethechannel nếu nó
nhận được PAGP packet.
- Desirable: Nó sẻ tự động cố gắng yêu cầu đầu kia
enable ethechannel.
- Cấu hình LACP:
Switch(config)#lacp system-priority priority
Switch(config-if)#channel-protocol lacp
Switch(config-if)#channel-group number mode {on | passive |
active}
Switch(config-if)# lacp port-priority priority
- Giải thích:
- Lệnh đầu tiên để xác định system priority để xác định
Switch nào làm Switch điều khiển Ethechannel, hoặc nế
u
Priority bằng nhau thì Switch nào có điạc chỉ mac nhỏ
hơn sẽ được chọn
- Ta còn xác định priority của port để xác định xem
port nào là active và port nào ở trạng thái standby. Port
có priority nhỏ sẽ active và, lớn sẽ ở trạng thái standby
- Các mode trong lệnh channel-group On, Passive,
active tuần tự tương tự như On, Auto , Desirable trong
PAGP
Cấu hình cho sơ đồ thực tế
Error!
1. Giải thích sơ bộ về sơ đồ trên:
Ở sơ đồ này ta lấy lại sơ đồ bài qos trứơc đ
ể thực hiện Etherchannel giữa Core
va Access Switch. Ở đây thì ta sử dụng 4 port fastethernet 0/1 – 0/4 làm
etherchannel, Ta sẽ cấu hình ehterchannel dùng cả PAGP, và LACP. Trước
hết ta cấu hình PAGP.
2. Show run
Access#show run
Building configuration
Current configuration : 2238 bytes
version 12.1
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
hostname Access
enable password cisco
ip subnet-zero
no ip domain-lookup
spanning-tree mode pvst
spanning-tree extend system-id
interface FastEthernet0/1
switchport trunk encapsulation isl
switchport mode trunk
no ip address
duplex full
speed 100
channel-group 1 mode desirable
interface FastEthernet0/2
switchport trunk encapsulation isl
switchport mode trunk
no ip address
duplex full
speed 100
channel-group 1 mode desirable
interface FastEthernet0/3
switchport trunk encapsulation isl
switchport mode trunk
no ip address
duplex full
speed 100
channel-group 1 mode desirable
interface FastEthernet0/4
switchport trunk encapsulation isl
switchport mode trunk
no ip address
duplex full
speed 100
channel-group 1 mode desirable
interface FastEthernet0/5
switchport access vlan 2
switchport mode access
no ip address
interface FastEthernet0/6
no ip address
interface FastEthernet0/7
no ip address
interface FastEthernet0/8
no ip address
interface FastEthernet0/9
no ip address
interface FastEthernet0/10
no ip address
interface FastEthernet0/11
no ip address
interface FastEthernet0/12
no ip address
interface FastEthernet0/13
no ip address
interface FastEthernet0/14
no ip address
interface FastEthernet0/15
no ip address
interface FastEthernet0/16
no ip address
interface FastEthernet0/17
no ip address
interface FastEthernet0/18
no ip address
interface FastEthernet0/19
no ip address
interface FastEthernet0/20
no ip address
interface FastEthernet0/21
no ip address
interface FastEthernet0/22
no ip address
interface FastEthernet0/23
no ip address
interface FastEthernet0/24
no ip address
interface GigabitEthernet0/1
no ip address
interface GigabitEthernet0/2
no ip address
interface Vlan1
ip address 192.168.5.2 255.255.255.0
define interface-range cuong FastEthernet0/1 - 4
ip classless
ip http server
line con 0
logging synchronous
line vty 0 4
no login
line vty 5 15
login
end
Core#show run
Building configuration
Current configuration : 3016 bytes
version 12.1
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
hostname Core
enable password cisco
ip subnet-zero
ip routing
no ip domain-lookup
spanning-tree mode pvst
spanning-tree extend system-id
interface Port-channel1
switchport trunk encapsulation isl
switchport mode dynamic desirable
interface FastEthernet0/1
switchport trunk encapsulation isl
switchport mode dynamic desirable
duplex full
speed 100
channel-group 1 mode desirable
interface FastEthernet0/2
switchport trunk encapsulation isl
switchport mode dynamic desirable
duplex ful
l
speed 100
channel-group 1 mode desirable
interface FastEthernet0/3
switchport trunk encapsulation isl
switchport mode dynamic desirable
duplex full
speed 100
channel-group 1 mode desirable
interface FastEthernet0/4
switchport trunk encapsulation isl
switchport mode dynamic desirable
duplex full
speed 100
channel-group 1 mode desirable
interface FastEthernet0/5
no switchport
ip address 192.168.3.2 255.255.255.0
duplex half
speed 100
interface FastEthernet0/6
switchport mode dynamic desirable
interface
FastEthernet0/7
switchport mode dynamic desirable
interface FastEthernet0/8
switchport mode dynamic desirable
interface FastEthernet0/9
switchport mode access
interface FastEthernet0/10
switchport mode dynamic desirable
interface FastEthernet0/11
switchport mode dynamic desirable
interface FastEthernet0/12
switchport mode dynamic desirable
interface FastEthernet0/13
switchport mode dynamic desirable
interface FastEthernet0/14
switchport mode dynamic desirable
interface FastEthernet0/15
switchport mode dynamic desirable
interface FastEthernet0/16
switchport mode dynamic desirable
interface FastEthernet0/17
switchport mode dynamic desirable
interface FastEthernet0/18
switchport mode dynamic desirable
interface FastEthernet0/19
switchport mode dynamic desirable
interface FastEthernet0/20
switchport mode dynamic desirable
interface FastEthernet0/21
switchport mode dynamic desirable
interface FastEthernet0/22
switchport mode dynamic desirable
interface FastEthernet0/23
switchport mode dynamic desirable
interface FastEthernet0/24
switchport mode dynamic desirable
interface GigabitEthernet0/1
switchport mode dynamic desirable
interface GigabitEthernet0/2
switchport mode dynamic desirable
interface Vlan1
ip address 192.168.5.1 255.255.255.0
interface Vlan2
ip address 192.168.2.1 255.255.255.0
define interface
-
range cuong FastEthernet0/1
-
4
router ospf 1
log-adjacency-changes
passive-interface Port-channel1
network 192.168.2.0 0.0.0.255 area 0
network 192.168.3.0 0.0.0.255 area 0
ip classless
ip http server
line con 0
logging synchronous
line vty 0 4
password cisco
no login
line vty 5 15
login
monitor session 1 source interface Po1
monitor session 1 destination interface Fa0/10
end
R1# show run
Building configuration
Current configuration:
version 12.1
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
hostname R1
enable password cisco
memory-size iomem 10
ip subnet-zero
no ip domain-lookup
interface Loopback1
ip address 11.1.1.1 255.255.255.0
interface Ethernet0/0
ip address 192.168.1.1 255.255.255.0
half-duplex
interface Serial0/0
no ip address
encapsulation frame-relay
no fair-queue
clockrate 64000
interface Serial0/0.122 point-to-point
ip address 172.16.1.1 255.255.255.0
frame-relay interface-dlci 122
interface Serial0/1
no ip address
shutdown
router ospf 1
log-adjacency-changes
network 11.0.0.0 0.0.0.255 area 0
network 172.16.1.0 0.0.0.255 area 0
network 192.168.1.0 0.0.0.255 area 0
ip classless
ip http server
access-list 101 permit ip 192.168.1.0 0.0.0.255 192.168.3.0
0.0.0.255
line con 0
logging synchronous
transport input none
line aux 0
line vty 0 4
no login
end
R2#show run
Building configuration
Current configuration:
version 12.0
service timestamps debug uptime
service
timestamps log uptime
no service password-encryption
hostname R2
enable password cisco
memory-size iomem 10
ip subnet-zero
no ip domain-lookup
-max-time 200
interface FastEthernet0/0
ip address 192.168.3.1 255.255.255.0
no ip directed-broadcast
speed 100
interface Serial0/0
no ip address
no ip directed-broadcast
encapsulation frame-relay
no ip mroute-cache
no fair-queue
clockrate 64000
cdp enable
frame-relay lmi-type cisco
interface Serial0/0.221 point-to-point
ip address 172.16.1.2 255.255.255.0
no ip directed-broadcast
frame-relay interface-dlci 221
interface Serial0/1
no ip address
no ip directed-broadcast
shutdown
router ospf 1
network 172.16.1.0 0.0.0.255 area 0
network 172.16.3.0 0.0.0.255 area 0
network 0.0.0.0 255.255.255.255 area 0
router rip
network 192.168.3.0
ip classless
ip http server
access-list 101 permit ip 172.16.2.0 0.0.0.255 192.168.1.0 0.0.0.255
line con 0
logging synchronous
transport input none
line aux 0
line vty 0 4
no login
no scheduler allocate
end
3. Kiểm tra:
- Show etherchannel port để xem trạng thái của tất cả các port
trong group
-
Core#show etherchannel port
Channel-group listing:
Group: 1
Ports in the group:
Port: Fa0/1
Port state = Up Mstr In-Bndl
Channel group = 1 Mode = Desirable-Sl Gcchange = 0
Port-channel = Po1 GC = 0x00010001 Pseudo port-
channel = Po1
Port index = 0 Load = 0x00 Protocol = PAgP
Flags: S - Device is sending Slow hello. C -
Device is in Consistent
state.
A - Device is in Auto mode. P - Device learns on physical port.
d - PAgP is down.
Timers: H
-
Hello timer is running.
Q
-
Quit timer is running.
S - Switching timer is running. I - Interface timer is running.
Local information:
Hello Partner PAgP Learning Group
Port Flags State Timers Interval
Count Priority Method Ifindex
Fa0/1 SC U6/S7 H 30s 1 128 Any 29
Partner's information:
Partner Partner Partner Partner Group
Port Name Device ID Port Age Flags Cap.
Fa0/1 Access 000d.bc33.2b00 Fa0/1 0s
SC 10001
Age of the port in the current state: 00d:00h:06m:04s
Port: Fa0/2
Port state = Up Mstr In-Bndl
Channel group = 1 Mode = Desirable-Sl Gcchange = 0
Port-channel = Po1 GC = 0x00010001 Pseudo port-
channel = Po1
Port index = 0 Load = 0x00 Protocol = PAgP
Flags: S - Device is sending Slow hello. C -
Device is in Consistent
state.
A - Device is in Auto mode. P - Device learns on physical port.
d - PAgP is down.
Timers: H
-
Hello timer is running.
Q
-
Quit timer is running.
S - Switching timer is running. I - Interface timer is running.
Local information:
Hello Partner PAgP Learning Group
Port Flags State Timers Interval
Count Priority Method Ifindex
Fa0/2 SC U6/S7 H 30s 1 128 Any 29
Partner's information:
Partner Partner Partner Partner Group
Port Name Device ID Port Age Flags Cap.
Fa0/2 Access 000d.bc33.2b00 Fa0/2 2s
SC 10001
Age of the port in the current state: 00d:00h:32m:20s
Port: Fa0/3
Port state = Up Mstr In-Bndl
Channel group = 1 Mode = Desirable-Sl Gcchange = 0
Port-channel = Po1 GC = 0x00010001 Pseudo port-
channel = Po1
Port index = 0 Load = 0x00 Protocol = PAgP
Flags: S - Device is sending Slow hello. C -
Device is in Consistent
state.
A - Device is in Auto mode. P - Device learns on physical port.
d - PAgP is down.
Timers: H
-
Hello timer is running.
Q
-
Quit timer is running.
S - Switching timer is running. I - Interface timer is running.
Local information:
Hello Partner PAgP Learning Group
Port Flags State Timers Interval
Count Priority Method Ifindex
Fa0/3 SC U6/S7 H 30s 1 128 Any 29
Partner's information:
Partner Partner Partner Partner Group
Port Name Device ID Port Age Flags Cap.
Fa0/3 Access 000d.bc33.2b00 Fa0/3 14s
SC 10001
Age of the port in the current state: 00d:00h:04m:19s
Channel group = 1 Mode = Desirable-Sl Gcchange = 0
Port-channel = Po1 GC = 0x00010001 Pseudo port-
channel = Po1
Port index = 0 Load = 0x00 Protocol = PAgP
Flags: S - Device is sending Slow hello. C -
Device is in Consistent
state.
A - Device is in Auto mode. P - Device learns on physical port.
d - PAgP is down.
Timers: H - Hello timer is running. Q - Quit timer is running.
S - Switching timer is running. I - Interface timer is running.
Local information:
Hello
Partner
PAgP
Learning
Group
Port Flags State Timers Interval
Count Priority Method Ifindex
Fa0/4 SC U6/S7 H 30s 1 128 Any 29
Partner's information:
Partner Partner Partner Partner Group
Port Name Device ID Port Age Flags Cap.
Fa0/4 Access 000d.bc33.2b00 Fa0/4 14s
SC 10001
Age of the port in the current state: 00d:00h:48m:29s
- Ta có thể sử dụng lênh show etherchannel summary để dể
xem xét hơn.
Core#show etherchannel summary
Flags: D - down P - in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
u - unsuitable for bundling
U - in use f - failed to allocate aggregator
d - default port
Number of channel-groups in use: 1
Number of aggregators: 1
Group Port-channel Protocol Ports
+
+
+
1 Po1(SU) PAgP Fa0/1(P) Fa0/2(P) Fa0/3(P)
Fa0/4(P)
4. Kiểm tra bằng Ethereal:
- Khi 4 port đều up
Error!
- Khi ta shut dow một cổng củ
a group đó là fa0/2 và fa0/3 ta có
kết quả sau
Error!
5. Cấu hình LACP
Đối với cấu hình này thì ta cũng sữ dụng 4 interface fa0/1- fa0/4
làm etherchannel, Ở đây chỉ xét đến 2 Switch Core và Switch
Access thôi
- Show run để kiểm tra cấu hình
Core#sho run
Building configuration
Current configuration : 2142 bytes
version 12.1
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
hostname Core
enable password cisco
ip subnet-zero
lacp system-priority 100
interface Port-channel1
no ip address
interface FastEthernet0/1
switchport trunk encapsulation dot1q
switchport mode trunk
no ip address
channel-group 1 mode active
channel-protocol lacp
interface FastEthernet0/2
switchport trunk encapsulation dot1q
switchport mode trunk
no ip address
channel-group 1 mode active
channel-protocol lacp
interface FastEthernet0/3
switchport trunk encapsulation dot1q
switchport mode trunk
no ip address
channel
-
group 1 mode active
channel-protocol lacp
interface FastEthernet0/4
switchport trunk encapsulation dot1q
switchport mode trunk
no ip address
channel-group 1 mode active
channel-protocol lacp
interface FastEthernet0/5
switchport mode access
no ip address
spanning-tree portfast
interface FastEthernet0/6
no ip address
interface FastEthernet0/7
no ip address
interface FastEthernet0/8
no ip address
interface FastEthernet0/9
no ip address
interface FastEthernet0/10
no ip address
interface FastEthernet0/11
no ip address
interface FastEthernet0/12
no ip address
interface FastEthernet0/13
no ip address
interface FastEthernet0/14
no ip address
interface FastEthernet0/15
no ip address
interface FastEthernet0/16
no ip address
interface FastEthernet0/17
no ip address
interface FastEthernet0/18
no ip address
interface FastEthernet0/19
no ip address
interface FastEthernet0/20
no ip address
interface FastEthernet0/21
no ip address
