Cisco NBAR

We are using “match protocol rtp audio” in the QoS Class Maps w/o NBAR Protocol Discovery to look inside the packets to match on the CE router. Is that OK?
totaramAsked:
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JustInCaseConnect With a Mentor Network EngineerCommented:
So, how did peeking inside of packet get taken place earlier?
There were no peeking inside packet at that level before NBAR. Expansion of P2P applications (kazaa, eDonkey, BitTorrent, WinMX..) created a need to peek into packets. Generally, marking of traffic was done by extended ACLs (up to L4 of  OSI model), upper levels were not included.
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JustInCaseNetwork EngineerCommented:
Not OK. You need to use NBAR for that match.
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totaramAuthor Commented:
I have never used NBAR in past, Can you please provide some config steps to include NBAR for using it?
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JustInCaseNetwork EngineerCommented:
NBAR should be enabled per interface basis
interface Gi1/0/49
 ip nbar protocol-discovery

more details - Chapter: Enabling Protocol Discovery
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totaramAuthor Commented:
Just a quick question: NBAR is a recent thing but QoS has been around for long time. So, how did peeking inside of packet get taken place earlier?
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totaramAuthor Commented:
Thanks
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