Refer to the exhibit. A network operator must configure CSR1 interfaces GigabitEthernet2 and GigabitEthernet3 to rewrite VLAN tags 12 and 21 for traffic between R1 and R2, respectively. Which configuration accomplishes this task? A. B. C. D.
is D
A service instance must be attached to a bridge domain. Flooding and communication behavior of a bridge domain is similar to that of a VLAN domain. Bridge-domain membership is determined by which service instances have joined it, while VLAN domain membership is determined by the VLAN tag in the packet.
https://www.cisco.com/c/en/us/td/docs/routers/asr920/configuration/guide/ce/b_ce_xe-313s-asr920-book/b_ce_xe-313s-asr920-book_chapter_01.html
Your documentación is for IOS XR the CSR is XE
A service instance must be attached to a bridge domain. Flooding and communication behavior of a bridge domain is similar to that of a VLAN domain. Bridge-domain membership is determined by which service instances have joined it, while VLAN domain membership is determined by the VLAN tag in the packet.
https://www.cisco.com/c/en/us/td/docs/routers/asr920/configuration/guide/ce/b_ce_xe-313s-asr920-book/b_ce_xe-313s-asr920-book_chapter_01.html
I have tried all the options, as a case study
only this option worked
interface GigabitEthernet1 ======================== CSR
service instance 12 ethernet
encapsulation dot1q 12
rewrite ingress tag translate 1-to-1 dot1q 21
rewrite egress tag translate 1-to-1 dot1q 12
bridge-domain 10
interface GigabitEthernet2
service instance 21 ethernet
encapsulation dot1q 21
rewrite ingress tag translate 1-to-1 dot1q 12
rewrite egress tag translate 1-to-1 dot1q 21
bridge-domain 10
The correct answer is D
I wanted to copy all the config, the configuration was very long, the website did not let me publish it
“A service instance must be attached to a bridge domain”
Something needs to link these 2 interfaces together, the rewrite Egress doesn’t put it into the local vlan database.
I say the bridge domain is needed in the config.
IOS-XE (CSR) guide
https://www.cisco.com/c/en/us/td/docs/routers/asr920/configuration/guide/ce/17-1-1/b-ce-xe-17-1-asr920/b-ce-xe-17-1-asr920_chapter_010.pdf
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