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Beginner

Configuring Service instance on ASR900 with redundancy

hello every one ,

Please check attached document ....Our requirement is

Requirement :   Drop tagged data (200,300,400) coming from ASR9000 to respective ASR920 (a,b,c) respectively by using EoMPLS L2VPN  .

Configuration Steps:

1)  Service instance  are created on ASR 907 ,as Router ASR 907 will see vlan tag attached and will send to   respective instance configured on ASR 920 , Service instance are created on destination ASR920 respectively .

2) Uplink on ASR 9000 toward ASR907 is configured as sub interface with Vlan 200,300,400 .

3) Loopback are configured on each ASR .

4) IGP (OSPF with MPLS LDP is configured between internal Ring from 920a to 920c).

4) Configuration on ASR 907 a and ASR 907 b for Service instance are

ASR907a> enable

ASR907a# configure terminal

ASR907a (config)#interface TenGigabitEthernet 0/0/0

ASR907a(config)#description **Connected to ASR9K**

ASR907a (config-if)#no ip address

ASR907a (config-if)#no shut

 

ASR907a (config-if)# service instance 200 ethernet

ASR907a (config-if-srv)# encapsulation dot1q 200

ASR907a (config-if-srv)# xconnect 10.10.10.2 200 encapsulation mpls

ASR907a (config)# exit

 

ASR907a (config-if)# service instance 300 ethernet

ASR907a (config-if-srv)# encapsulation dot1q 300

ASR907a (config-if-srv)# xconnect 10.10.10.3 300 encapsulation mpls

ASR907a (config)# exit

 

ASR907a (config)# service instance 400 ethernet

ASR907a (config-if-srv)# encapsulation dot1q 400

ASR907a (config-if-srv)# xconnect 10.10.10.4 400 encapsulation mpls

ASR907a (config)# exit 

 

same on ASR 907b

 

 Configuration Steps on ASR 920 a,   are

 

ASR920a (config)#interface gigabitethernet 0/0/2

ASR920a (config)#description **Connected to CE Node**

ASR920a (config-if)#no ip address

ASR920a (config-if)#no shut

ASR920a (config-if)# service instance 200 ethernet

ASR920a (config-if-srv)# encapsulation dot1q 200

ASR920a (config-if-srv)# xconnect 10.10.10.1 200 encapsulation mpls

ASR920a (config)# backup peer 10.10.10.5 200 pw-class pw1

ASR920a (config)# backup delay 5

ASR920a (config)# exit

 

Configuration Steps on ASR 920 b for EoMPLS L2 VPN

 

ASR920b(config)# pseudowire-class pw1

ASR920b(config-pw-class)# encapsulation mpls

ASR920b(config)# backup delay 0 10

 

ASR920b (config)#interface gigabitethernet 0/0/1

ASR920b (config)#description **Connected to CE Node**

ASR920b (config-if)#no ip address

ASR920b (config-if)#no shut

ASR920b (config-if)# service instance 300 ethernet

ASR920b (config-if-srv)# encapsulation dot1q 300

ASR920b (config-if-srv)# xconnect 10.10.10.1 300 encapsulation mpls

ASR920b (config)# backup peer 10.10.10.5 300 pw-class pw1

ASR920b (config)# backup delay 5

ASR920b (config)# exit

 

Configuration Steps on ASR 920 c for EoMPLS L2 VPN

 

ASR920c(config)# pseudowire-class pw1

ASR920c(config-pw-class)# encapsulation mpls

ASR920c(config)# backup delay 0 10

 

ASR920c (config)#interface gigabitethernet 0/0/0

ASR920c (config)#description **Connected to CE Node**

ASR920c (config-if)#no ip address

ASR920c (config-if)#no shut

ASR920c (config-if)# service instance 400 ethernet

ASR920c (config-if-srv)# encapsulation dot1q 400

ASR920c (config-if-srv)# xconnect 10.10.10.1 400 encapsulation mpls

ASR920c (config)# backup peer 10.10.10.5 400 pw-class pw1

ASR920c (config)# backup delay 5

ASR920c (config)# exit

 

Confusion point : Do I need to add "rewrite ingress tag pop 1 symmetric"

 

Please check and reply ......your prompt guide will be appreciated.

Best Regards

NUHU

3 REPLIES 3
Highlighted
Cisco Employee

Re: Configuring Service instance on ASR900 with redundancy

Rewrite is only needed when you want to manipulate the tags on the EFP.

 

Elvin

Highlighted
Beginner

Re: Configuring Service instance on ASR900 with redundancy

Hi, it's depend of the scenario. So follow your description I recommend to use the commands "rewrite ingress tag pop 1 symmetric" .

 

Regards

Highlighted
Cisco Employee

Re: Configuring Service instance on ASR900 with redundancy

Hi Nuhu,

 

"rewrite ingress tag pop 1 symmetric" is not required for your use case. Because you are matching and dropping packets with tag 200, 300 or 400.

 

"rewrite ingress tag pop 1 symmetric" will be useful if you need to handle different services across the MPLS cloud.

 

regards,

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