week5、study the protocol of 802.1ag and config the topology of olt agg and bng
Ethernet OAM,CCM, LTM, LTR, LBM, LBR, MEP, MIP.
Ethernet OAM是應用在乙太網中的OAM機制。主要通過EFM（Ethernet in the First Mile，最後一英里乙太網）和CFM（ConnectivityFault Management，連線性故障管理）分別工作在乙太網鏈路層和乙太網業務層，對網路進行操作管理維護功能
EFM針對乙太網中的點到點或者虛擬點到點鏈路進行監控和故障管理，相當於是乙太網中的“交警”
CFM可以實現業務層的端到端OAM監控和管理功能，就像檢察院一樣，能夠在運用上、提供商和使用者的橋網路中進行任意的檢查、隔離和連線性故障報告。
802.11ag 是IEEE提出的一個用於Ethernet網路中進行錯誤管理的一個標準即CFM。
CFM (connectivity faultmanagement) : l連線故障管理
路徑發現、故障檢測、故障確認和定位、故障通知、故障恢復（和STP一起）
802.1ag的核心是對MD所提供的每一個服務所涉及到的部分或全部節點進行維護監控，從而發現故障以及定位出故障的網路段。
MD(maintenance domain):維護域
MP(maintenance point):維護點 --參與維護監控的節點 （具體到port）包括MEP、MIP
MEP(maintenance association endpoint)：維護端點
MIP(maintenance domain intermediatepoint)：維護中間點
每一個service都有兩個以上MEP，這些組合稱為MA(maintenance association)維護關聯
每個MA對應一個服務例項（serviceinstance），802.1ag就是對每個MA進行管理維護，檢測MA中的故障，即檢測service instance中的故障。
MA中每個MEP之間點到店的連線稱為維護實體，是CFM作用的最小單位。
DoSAP(Domain Service AccessPoint)：維護域服務接入點 – 為慰藉提供訪問本MD的介面
理論上，一個MEP就是一個維護域服務接入點
在Ethernet裡，serviceinstance通常由vlanId來表示
MEP分為兩種：Up MEP andDown MEP
MIP不能配置在DoSAP上，而只能是ISAP(internal service access point)
MIP是雙向的，沒有UP/DOWN之分
路徑發現：LTM(link trace message)：連結追蹤報文
故障檢測：CCM(connectivity checkmessage)：連線檢查報文：專門用來故障檢測
故障確認：LBM(loopback message)：環回報文
故障定位：可以使用LBM，也可以使用LTM，LTM更有效
LTR(link trace reply)：連結追蹤回覆
LTM和LTR在CFM中的作用是路徑發現和故障定位，逐跳檢查
LBR(loopback reply)：環回回復
LBM和LBR在CFM中的作用是故障確認和故障定位
802.1ag詳解參考資料：
http://wenku.baidu.com/link?url=FYhMcznWCRO1FkS0fJCGFXvcf8YI9BCYF872RZQHikkruUkv3yDXufHs7HFgUdPgPM9pxGpuAcIhI4XzBAOpWeeOwJWGh1mnWdg19EWMZ6i
配置拓撲結構：
用SecreCR遠端連線裝置
OLT：
EOAM-M>create vlan 314 tlan enabled
success: Create VLAN 314.
EOAM-M>create meg auto_meg1 vlan 314level 3 meg-id-format 8021ag-maid ccm-interval 1sec
success: Create maintenance entity group"auto_meg1".
EOAM-M>add mep interface 1/2/g1 to-megauto_meg1 id 3140 direction down continuity-check enabled admin-state enabled
critical ALARM for maintenance endpoint3140 in "auto_meg1" at 2016/12/14 17:12:29.10:
"CCM loss of continuity"
(affects service)
success: Create maintenance endpoint 3140in "auto_meg1".
EOAM-M>enable eth-port 1/2/g1
success: Enable Ethernet port"1/2/g1".
EOAM-M>show meg
maintenance entity group"auto_meg1":
VLAN : 314
Level : 3
MEG ID format : 802.1ag MAID
CCM interval : 1 sec
Auto-discovery : enabled
Auto-discovery timeout : 10.0 seconds
Minimum CC defect : remote CCM
Alarm time : 2.500 seconds
Alarm reset period : 10.000 seconds
Admin status : enabled
1 maintenance entity group found.
EOAM-M>enable eth-port 1/2/g1
EOAM-M>show remote-mep discovered
ID MAC Address State Discovered On
---- ----------------- -------------------------------------------------------
3141 c0:7b:bc:60:a8:9a mep: Ok auto_meg1/3140
port: Up (Intf 1/2/g1)
@2017/07/23 10:41:22
1 remote maintenance endpoint found.
EOAM-M>test link-trace meg auto_meg1 mepid 3140 to-remote-mep 3141
success: Test Link Trace trans-id formaintenance endpoint 3140 in "auto_meg1" is 1.
EOAM-M>show link-trace meg auto_meg1 mepid 3140 trans-id 1
Link trace started at 2016/12/14 17:24:50:
TTL MAC Address LTM Forwarded Remote MEP Reached
--- ----------------- -------------------------------
15 c0:7b:bc:60:a8:9a no yes
1 hop in link trace.
EOAM-M>test link-trace meg auto_meg1 mepid 3140 to-remote-mep 3141
success: Test Link Trace trans-id formaintenance endpoint 3140 in "auto_meg1" is 2.
EOAM-M>show link-trace meg auto_meg1 mepid 3140 trans-id 2
Link trace started at 2016/12/14 17:30:51:
TTL MAC Address LTM Forwarded Remote MEP Reached
--- ----------------- -------------------------------
15 c0:7b:bc:60:a8:9a no yes
1 hop in link trace.
EOAM-M>test link-trace meg auto_meg1 mepid 3140 to-remote-mep 3141
success: Test Link Trace trans-id formaintenance endpoint 3140 in "auto_meg1" is 3.
EOAM-M>show link-trace meg auto_meg1 mepid 3140 trans-id 3
Link trace started at 2016/12/14 17:32:31:
TTL MAC Address LTM Forwarded Remote MEP Reached
--- ----------------- -------------------------------
14 c0:7b:bc:60:a8:9a no yes
15 00:02:5d:d8:20:41 yes no
2 hops in link trace.
恢復：
EOAM-M>remove mep interface 1/2/g1from-meg auto_meg1
Alarm CLEARED for maintenance endpoint 3140in "auto_meg1" at 2016/12/16 12:47:47.44:
"CCM loss of continuity"
success: Delete maintenance endpoint 3140in "auto_meg1".
EOAM-M>delete meg auto_meg1
success: Delete maintenance entity group"auto_meg1".
EOAM-M>delete vlan 314
success: Delete VLAN 314.
AGG
EOAM-Standalone>create vlan 314 tlanenabled
success: Create VLAN 314.
EOAM-Standalone>create meg auto_meg1vlan 314 level 3 meg-id-format 8021ag-maid ccm-interval 1sec
success: Create maintenance entity group"auto_meg1".
EOAM-Standalone>enable eth-port 1/g1
success: Enable Ethernet port"1/g1".
EOAM-Standalone>enable eth-port 2/g1
success: Enable Ethernet port"2/g1".
EOAM-Standalone>add interface 1/g1to-vlan 314
success: Add VLAN 314 member -- interface"1/g1".
EOAM-Standalone>add interface 2/g1to-vlan 314
success: Add VLAN 314 member -- interface"2/g1".
EOAM-Standalone>show vlan 314 members
VLAN Member Type Associated Via
---- --------------------------------------- ------------------------------
314 1/g1 Ethernet membership
314 2/g1 Ethernet membership
EOAM-Standalone>show eth-port
* = pluggable module is present
Port Current State Interface Status
----------- ------------------------------------------------- ----------------
1/x3 down ethernet systemdisabled
1/x4 down ethernet user disabled
*1/g1 down ethernet user disabled
*1/g2 down ethernet user disabled
*2/x3 up 1g full-duplex RX-TX ethernet enabled
2/x4 down ethernet user disabled
*2/g1 down ethernet user disabled
*2/g2 down ethernet user disabled
8 Ethernet ports found.
EOAM-Standalone>add mip interface 2/g1to-meg auto_meg1 admin-state enabled
success: Create maintenance intermediatepoint 1 in "auto_meg1".
EOAM-Standalone>show mgmt-cfg
IP address : 0.0.0.0
Netmask : 0.0.0.0
MAC Address : 00:02:5d:d8:20:41
VLAN : none
Admin status : disabled
Operational status : user disabled
恢復：
EOAM-Standalone>remove mip interface2/g1 from-meg auto_meg1
success: Delete maintenance intermediatepoint 1 in "auto_meg1".
EOAM-Standalone>remove interface 2/g1from-vlan 314
success: Remove VLAN 314 member --interface "2/g1".
EOAM-Standalone>remove interface 1/g1from-vlan 314
success: Remove VLAN 314 member --interface "1/g1".
EOAM-Standalone>delete meg auto_meg1
success: Delete maintenance entity group"auto_meg1".
EOAM-Standalone>delete vlan 314
success: Delete VLAN 314.
BNG
C7-SIT-EOAM#configure terminal
Enter configuration commands, one perline. End with CNTL/Z.
C7-SIT-EOAM(config)#vlan 314
C7-SIT-EOAM(config-vlan)#exit
C7-SIT-EOAM(config)#ethernet cfm domainauto_meg1 level 3
C7-SIT-EOAM(config-ecfm)#id null
C7-SIT-EOAM(config-ecfm)#service auto_meg1vlan 314 direction down
C7-SIT-EOAM(config-ecfm)#continuity-check
C7-SIT-EOAM(config-ecfm-srv)#continuity-checkinterval 1s
C7-SIT-EOAM(config-ecfm-srv)#exit
C7-SIT-EOAM(config)#interface fastEthernet0/24
C7-SIT-EOAM(config-if)#no shutdown
C7-SIT-EOAM(config-if)#switchport trunkallowed vlan add 314
C7-SIT-EOAM(config-if)#switchport modetrunk
C7-SIT-EOAM(config-if)#ethernet cfm mepdomain auto_meg1 mpid 3141 service auto_meg1
C7-SIT-EOAM(config-if-ecfm-mep)#exit (ctrl c)
C7-SIT-EOAM(config-if) #exit
C7-SIT-EOAM(config)# exit
C7-SIT-EOAM#
C7-SIT-EOAM#show interfaces fastEthernet0/24
FastEthernet0/24 is up, line protocol is up(connected)
恢復：
[2016/12/1614:40] Calvin Zhang:
configure terminal
interface fastEthernet 0/24
no ethernet cfm mep domain auto_meg1mpid 3141 service auto_meg1
end
configure terminal
interface fastEthernet 0/24
switchport trunk allowed vlan remove314
end
configure terminal
no ethernet cfm domain auto_meg1 level3
end
configure terminal
no vlan 314
end