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How to deploy VPLS and port mirror service

Publication Date:  2014-12-16 Views:  27 Downloads:  0
Issue Description

Country C carrier M customers  want to monitor 3G business by configuring the local  mirror . But some 3G data in other equipment room, so customers plan to monitor network-wide 3G  real - time traffic  by using VPLS business converge to  the center equipment room .

The physical connection is according to the following:

Image server PE1 ------ PE2 ------- R3 -------RNC (between PE1 and PE2 is wide area network, the others connected by GE interface directly)

After customers deploying , they found the traffic of observe interface on R3 is the same as the interface on RNC, while there is  no traffic on the AC interface of PE1

Handling Process

Process process as follows:

1. There is traffic on the observe interface on R3 , so we can sure it's no matter with the configuration of port mirror
2. then testing VPLS business and found VPLS ping  was also normal.
3. and then delete  the mirror port configurations on R3, configure it with three-layer IP address which is in the same network segment with the mirror server.  The ping test was also OK , this can prove the VPLS service was normal .

4. where was the flow  lost? Check the MAC address table as follows:


Display  mac - address  when the vpls is enable

 

MAC address  table of  slot2:
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
MACAddress       VLAN /             PE VLAN CE VLAN Port                       Type           LSP. The LSR - ID is improperly
VSI / SI                                                                                           MAC-Tunnel
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
101b -543 e - 5ada VPLS, Mirror,          .           GE1 1/0 14               Dynamic     2/0
- 3G
101b -543 e - 5ad2 VPLS, Mirror,          .           GE1 1/0 14               Dynamic     2/0
- 3G
0000 5e00 -0122 VPLS - Mirror,          .           GE1 1/0 14               Dynamic     2/0
- 3G

Display mac - address | in 101b -543 e - 5ada / / when vpls is disabled

MACaddresstableofslot1:
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
MACAddress       VLAN /             PE VLAN CE VLAN Port                       Type           LSP. The LSR - ID is improperly
VSI / SI                                                                                           MAC-Tunnel
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
101b -543 e - 5ada 3412              .          .           GE2 and no                 Dynamic     1 / -



PE2 and R3 configure VRRP to carry RNC business, so the two routers have the same MAC address table (3G), and because of R3 port mirror, these MAC addresses learnt by  PE2 again.So befor the VPLS forwarding traffic it  would drop the traffic with the MAC . After disable the  VPLS MAC address learning function, the problem was solved.


Root Cause

PE2 and R3 configure VRRP to carry RNC business, so the two routers have the same MAC address table (3G), and because of R3 port mirror, these MAC addresses learnt by  PE2 again.So befor the VPLS forwarding traffic it  would drop the traffic with the MAC . After disable the  VPLS MAC address learning function, the problem was solved.

Solution

1.disable VPLS MAC address learning function.

VsiVPLS - Mirror, 3G static
L 2- multicast limit max
Vrid 31
Peer 192.168.193.233
MAC - learning disable

2 change VPLS into VLL. If there is multiple pairs to 1, you can enable VPLS on  mirror server ,while  other PE still use  VLL.

3. change the local port mirror to remote port mirror.

Suggestions

Key  point:

1. On the PE2, broadcast domains on the equipment is vlan value, and MAC tables were isolated ,it can be normal.

2. when the packets of different vlans  mirroring , the  mac table of these packets would be conflated on R2 , and it's most possibly  lead mac conflict

3. Along with business needs, the same equipment carries many kinds of service. It would be much more possiblility with the same mac and different IP scene , this should be avoid.

END