Which Cisco Locator/ID Separation Protocol (LISP) device receives packets from remote site facing devices and either decapsulates the LISP packets or routes them natively?
I think there is a type in this question... This is directly from the OnDemandLearning that costs $1000.00
Ingress tunnel router (ITR): An ITR is a LISP site edge device that receives packets from site-facing interfaces (internal hosts) and encapsulates them to remote LISP sites, or natively forwards them to non-LISP sites.
Egress tunnel router (ETR): An ETR is a LISP site edge device that receives packets from core-facing interfaces (the transport infrastructure), de-encapsulates LISP packets, and delivers them to local EIDs at the site.
While B may look right, the ETR doesn't forward anything natively. While A may NOT look right, it DOES forward things natively. I think the question is supposed to say "encapsulates" as both A and B are wrong without that fix.
Yes, why would it need to de-encapsulate LISP packets before they have even entered into LISP? However, I am guessing people are reading this as a remote site is sending the traffic across the LISP tunnel and the ETR is de-encapsulating it. HOWEVER, the native forwarding is what changes everything, because nothing within a LISP tunnel would need to be natively forwarded, or why would it have been sent to the ETR? Only the ITR would receive traffic and decide it needs to natively forward a packet without encapsulating it.
Corret Answer is B. The question is not clear. Cisco means "natively delivers non-LISP packets to local EIDs at the site" ( better then "routes them natively"). ETR could works also as a normal CPE Router, beyond that SD role), routing packet in a native way
https://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/locator-id-separation-protocol-lisp/datasheet_c78-576698.pdf
it´s B
https://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/locator-id-separation-protocol-lisp/datasheet_c78-576698.html#:~:text=%E2%80%A2%20ITR%2DIngress,at%20the%20site.
https://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/locator-id-separation-protocol-lisp/datasheet_c78-576698.html
LISP Site Edge Devices
• ITR-Ingress Tunnel Router is deployed as a CE device. It receives packets from site-facing interfaces, and either encapsulates packets to remote LISP sites or natively forwards packets to non-LISP sites.
• ETR-Egress Tunnel Router is deployed as a CE device. It receives packets from core-facing interfaces and either decapsulates LISP packets or natively delivers non-LISP packets to local EIDs at the site.
LISP Site Edge Devices
• ITR-Ingress Tunnel Router is deployed as a CE device. It receives packets from site-facing interfaces, and either encapsulates packets to remote LISP sites or natively forwards packets to non-LISP sites.
• ETR-Egress Tunnel Router is deployed as a CE device. It receives packets from core-facing interfaces and either decapsulates LISP packets or natively delivers non-LISP packets to local EIDs at the site.
Both ETR and ITR receive packets and natively forward them, so the question's key part is " receives packets from remote site facing devices". If the packets are coming from a remote site, it means they are coming from the network core. Thus, by definition, the answer is ETR.
So, here is the question.
Which Cisco Locator/ID Separation Protocol (LISP) device receives packets from remote site facing devices and either decapsulates the LISP packets or routes them natively?
ITR-Ingress Tunnel Router is deployed as a CE device. It receives packets from site-facing interfaces, and either encapsulates packets to remote LISP sites or natively forwards packets to non-LISP sites.
• ETR-Egress Tunnel Router is deployed as a CE device. It receives packets from core-facing interfaces and either decapsulates LISP packets or natively delivers non-LISP packets to local EIDs at the site.
Is it me, or do neither of these fit?
I am for B, because there are 2 key words in the question "recieves" and "decapsulates" , it's all about ETR only. ITR sends and ecapsulates (recieves from IP side only)
ETR-Egress Tunnel Router is deployed as a CE device. It receives packets from core-facing interfaces and either decapsulates LISP packets or natively delivers non-LISP packets to local EIDs at the site.
https://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/locator-id-separation-protocol-lisp/datasheet_c78-576698.html
i was also for B until I read this article ... it is A....
I think this is B - ETR:
From the question - which device "receives packets from remote site facing devices" and "decapsulates the LISP packets"
From https://www.ciscopress.com/articles/article.asp?p=2992605
An ITR (option A) "encapsulates them to the remote LISP site", which seems to be the opposite of what the question is asking
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