My first question,when we are using switchport voice vlan dot1p ,I thought we instruct the switch port to use 802.1P priority tagging for voice traffic and to use the default native VLAN (VLAN 0) to carry all traffic.Do I still need to create a Vlan 20 for data and Vlan 10 for voice ?
Secondly,same tutorial adds these commands as well,Do you think for our set up, using those commands are feasible ?
The command "switchport mode access" instructs the switch to use 802.3 frame (untagged frame, no vlan).
The command "switchport mode trunk" instructs the switch to use 802.1q frame (tagged frame, vlan).
The command "switchport voice vlan dot1p" instructs the switch to use 802.1p priority tagging for voice. 802.1p resides within the 802.1q header so the swtich port is in an "hybrid" mode and can handle both frames (tagged and untagged). Voice traffic will be put in a tagged 802.1q frame with the voice vlan and so the voice vlan should be declared with the command "switchport voice vlan". The CDP will inform the neighbor device of this configuration.
All other (not tagged) data traffic will be put in the native vlan. The vlan 0 is reserved and used only for internal processes. So you must declare also a native vlan. (If you configure an access ports where the voice and data reside on the same vlan, with no explicit configuration for a voice vlan, the phone will tag the voice frame with dot1q and insert a vlan of zero telling the switch they are only using dot1p and that the frame belongs to the native vlan).
"Priority" commands work in conjunction with QoS. If you have enable QoS at global level you get advantage during the use.
"Spanning tree" commands enable protection against unwanted incoming BPDU and set the port in forwarding state in few seconds. You can search the exact function in the IOS reference guide.
Same config also for the second switch. You can use all ports indifferently.
I suggest you to use an 802.1q trunk to connect switches. something like this:
Introduction: The "external-out enable" command is available for
configuration under the "router ospf process" in case of the IOS-XR
operating system. This command basically enables advertisement of
intra-area routes on the device as external routes in th...
IntroductionIn this article we'll discuss how to troubleshoot packet
loss in the asr9000 and specifically understanding the NP drop counters,
what they mean and what you can do to mitigate them. This document will
be an ongoing effort to improve troublesh...