ā07-06-2012 07:14 AM - edited ā03-07-2019 07:38 AM
HI,
I hope all are well and can pls help / advise with the following
We have HSRP between NexusA and NexusB with access layer switches connecting to the core using VPC
We are trying to setup a VAM server Voice recording for Siemens phones.
We need to span all voice vlan and point it to the VAM server the VAM server connects to a 3750 Stack considering the amount of traffic multiple span session can generate I plan to move the server to the Nexus directly and run a Local Span Session. (Is that a good idea ?)
My Question is
1> As we have two Nexus running HSRP and VAM server only connects physically to one NexusA (I can run local span on that nexusA) the Second NexusB is not directly connected to the VAM server I plan to run ERSPAN can you please confirm if this is the best design and which path will the span traffic take from Nexus B to NexusA will it go through the access layer switches depending on the vlans allowed on the uplinks or will it go through the 20 Gig uplink between the two Nexus allowing all vlans (VPN peer links) ?
WE have approximatley 10 voice vlans
Do we an example config for ERSPAN session where the source are vlans (As I am for fimilliar with RSPAN) ?
Thanks in advance
Zee
ā07-06-2012 07:49 AM
Hi,
I plan to move the server to the Nexus directly and run a Local Span Session. (Is that a good idea ?)
That should work fine, because:
When data rate is above 5Gbps, SPAN traffic is reduced to 0.75Gbps to avoid potential congestion over the link between ingress port and switch fabric
The aggregate SPAN traffic from all SPAN sources (including both RX and TX SPAN) canāt exceed 5Gbps per UPC
SPAN traffic wonāt affect data traffic when SPAN destination port is congested
Also, here is the config guide for ERSPAN:
HTH
ā07-08-2012 07:21 AM
Thanks Reza,
I have managed to setup the source session
Below is out out on nexus 1
HS-SR1-N5K-2# sh monitor session all
session 6
---------------
type : erspan-source
state : up
erspan-id : 100
vrf-name : default
destination-ip : 10.100.86.1
ip-ttl : 255
ip-dscp : 0
origin-ip : 10.100.85.2 (global)
source intf :
rx :
tx :
both :
source VLANs :
rx : 726,766
Nexus 2 is where I have my voip recorder connected
Do you how to configure a ERSPAN for a destination interface here (reading the URL above it states the Nexus 5K does not support Destination ERSPAN do you of a way I can get round this one) ?
With 6500 we normally use RSPAN can we do some simillar with Nexus 5K
Kind Regards,
Zee
ā07-11-2012 06:34 AM
Cisco Experts can you please help with teh ERSPAN on Nexus
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