Hi. I wonder if somebody could help with the following problem I'm having relating to RSPAN configuration.
Thanks in advance!
I’ve been tasked with SPANing traffic across our Cisco switch infrastructure in an office so we can mirror a subset of traffic to a single port.
The reason this is required is so we can present all voice traffic to a port connected to a voice recording server.
The network infrastructure I am currently using to test this set up is as follows:
- Primary 6509 distribution switch running IOS version: s72033-ipservices_wan-mz.122-33.SXH4.bin" (hostname - RS03-6509E-DIST-ML-01)
- Secondary 6509 distribution switch running IOS version: s72033-ipservices_wan-mz.122-33.SXH4.bin" (hostname - RS03-6509E-DIST-ML-02)
- the two switches are connected together via a statically configured VLAN trunk.
The configuration I have put in place to implement RSPAN is as shown here:
1 RS03-6509E-DIST-ML-01#
2
3 vlan 950
4 name RSPAN_VLAN_950
5 remote-span
6
7
8 interface Port-channel1
9 description **** L2 PORTCHANNEL TO DC2-6509-DIST-ML02 PORTS 3/47-48 4/47-48 ****
10 switchport
11 switchport trunk encapsulation dot1q
12 switchport trunk allowed vlan 32-36,38-42,44-47,140,144,950
13 switchport mode trunk
14
15 spanning-tree vlan 32,34,36,38-40,42,44,46,140,144,950 priority 16384
16
17 !
18 monitor session 1 type rspan-source
19 description ** RSPAN_SRC_SESSION **
20 source vlan 32 , 34 , 36
21 destination remote vlan 950
22 !
23 !
24 monitor session 11 type rspan-destination
25 description ** RSPAN_DST_SESSION **
26 source remote vlan 950
27 destination interface Gi7/10
28 !
29
30
31 RS03-6509E-DIST-ML-02#
32
33 !
34 vlan 950
35 name RSPAN_VLAN_950
36 remote-span
37 !
38 spanning-tree vlan 32,34,36,38-40,42,44,46,140,144,950 priority 8192
39
40 interface Port-channel1
41 description **** L2 PORTCHANNEL TO DC2-6509-DIST-ML012 PORTS 3/47-48 4/47-48 ****
42 switchport
43 switchport trunk encapsulation dot1q
44 switchport trunk allowed vlan 32-36,38-42,44-47,140,144,950
45 switchport mode trunk
46
47 !
48 monitor session 1 type rspan-source
49 description ** RSPAN_SRC_SESSION **
50 source vlan 32 , 34 , 36
51 destination remote vlan 950
52 !
53 !
54 monitor session 11 type rspan-destination
55 description ** RSPAN_DST_SESSION **
56 source remote vlan 950
57 destination interface Gi7/10
58 !
59 !
ISSUE –
The problem I have been experiencing is that the traffic which gets presented at the destination port on either distribution switch (Gig 7/10 on both) is not limited to the 3 x VLANs that I specified in the source lists (see lines 20 and 50). When sniffing either port (on either distribution 01 or 02) using Wireshark I’m seeing traffic for all VLANs present on the switches?
Any help understanding what’s wrong with this configuration would be much appreciated i.e. any advice as to how I can limit the traffic presented to port Gi7/10 to VLANs 32, 34 and 36 only?
Hope someone can help and thank you for reading my post,
Andy
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