Cisco Switching/Routing :: 5596 VLAN Traffic Span Across Vpc Peer-link
Apr 22, 2013
I have pair of 5596 switches in vPC. One host say "HOST A" is connected to the primary vPC peer and other "HOST B" on secondary vPC peer.Both are in same VLAN 10. Both hosts are vpc orphan ports as their NIC is configured in active/standby mode.I have configured span session on both vPC peers with span source as VLAN 10 in rx mode.Span destination is connected to secondary vPC peer. The issue here is that I am not able to capture the traffic originating from HOST A destined to HOST B which is traversing vPC peer-link.Same issue occurs for the traffic in reverse way and span destination on primary vPC peer. In a nutshell, any traffic which crosses vPC peer-link is not getting captured.
What could be the issue and is there any solution for it. Below mentioned is the span config and relevant interfaces. [code]
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Mar 17, 2013
I currently have Nexus 5596 pair with VPC peer link Po1 between them. My goal is to connect our new Nexus 7Ks to the 5K's using Fabric Path. My question is during this inital setup with the 7K's. Can I use the same port channel number on the 7K's as I did the 5K's? Is the port channel locally significat?
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Dec 12, 2011
Been dealing with a strange problem for several days now. It started out with a problem that I thought was VTP related but ended up being something else. I setup a span port on a 3750 that I am connected to that was mirroring the trunk connection coming into the switch.
Never saw an VTP traffic come across the connection but doing a sh vtp status indicated the traffic was arriving and getting processed. When I found some debug commands (debug sw-lan vtp), I was also able to see the packets go between switches. Seeing this issue concerns me that there is other traffic that isnt showing up during a span session.
I know that doing a span on a switch, especially using a trunk port as a source, isnt a good idea. Since I didnt have a TAP at time, this was my only choice. I have since borrowed a NetOptics TP-CU3 tap from a good friend and was able to confirm the VTP traffic was going across the trunk connection between switches.
All of my 3750's are running 12.2.55.SE.
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Dec 30, 2009
I do not see 802.1Q tags nor do I see p-bits (COS) in my wireshark captures. My setup is not working and I have no way to verify (sniff) that the 6509 is setting the p-bits to 3. [code]
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Mar 22, 2012
I have configured Span port on our 4510. We have an application 5view server to monitor trafic connected to G9/17 Since we have changed the network connection from physical Giga port and add a Port-channel instead, we don't see any more trafic from the new Port-channel to G9/17
We have the configuration below on our 4510 :
monitor session 1 source interface Gi4/6
monitor session 1 source interface Po20
monitor session 1 filter vlan 311 - 312 , 375
monitor session 1 destination interface Gi9/17
From the commands show, we don't see the trafic duplication from the source to the destination port :
Port Source
4510-5567#sh int po20
Port-channel20 is up, line protocol is up (connected)
Hardware is EtherChannel, address is 0016.9de2.a818 (bia 0016.9de2.a818)
[Code].....
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Jan 31, 2012
On a Catalyst 6500, we configured a SPAN session with VLAN 300 as a source. We configured the session bi-directional ("both" keyword). We connect a sniffer on the SPAN destination port.
Strangely enough, we only see the traffic from the VRF to the firewall, but not the reverse traffic ! What can be the problem ?
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Nov 2, 2011
Is it possible to configure the span(switch port analyzer) port and restrict it to only listen to ingress and egress of TCP/1433 from the source port?
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Feb 25, 2013
I am working on wi-fi networks (ISP), So I need to block the peer to peer on my network.My network involves cisco switch 2950/2960, cisco 2800 routers and Access Points, config for peer to peer blocking, for this where I need to config either switches or router.My network basic setup is, The internet will pass from router to switch and then Access Points.
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Feb 13, 2013
I am facing issues in blocking Peer to Peer applications in LAN. I am using 881 Cisco router and below is the config done. [code]
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Apr 19, 2012
I got ASA 5510 with base license, can I block all Peer-2-Peer traffic from inside to outside.
ASA Giga 0/0 connected to ISP Router 2811
ASA Giga 0/1 connected to LAN switch 3560
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Jul 25, 2011
I see that Application protection - blocking peer-to-peer file sharing traffic is a capability of Cisco IOS Firewall. How do i configure my Cisco 2911 ISR to block peer-to-peer file sharing traffic?
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Jun 25, 2012
What is the function of the VPC peer-link? Should be the composite of all VPC links that are dual homed between switches? is it necessary to have 8 x 10G links as shown above. The links connecting the 7Ks to the 5Ks are VPC links.
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Jan 3, 2013
i am in process of building a new datacenter with 2 nexus7k in core/aggregation and 2 n5k in access layer. I am running fabric path on F2 cards between 7k and 5k, also enabled vpc+ on 7k and 5 both. There are few vrfs on 7k which are communicating with each other through firewall contexts. Now there are few vlans which are used to connect differnt vrfs and firewall contexts on n7k and running hsrp as well. now since these vlans are not traversing FP network i should not logically configure these vlans as FP vlans. But since the vpc+ peer link is a FP link it will not allow non-FP vlans to communicate through itself. I have configured a vpc trunk link between 7k and fws. Diag is attched. Now my question is can i configure vlans used for connecting vrf and fw contexts as FP vlans so that hsrp running between those vlans can communicate with each other over vpc+ peer link on n7k.
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May 5, 2013
Can you use twinax cables to connect two Nexus 7010 switches for VPC peer link? They would connect on F2 modules and have Sup2 on the chassis.
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Aug 7, 2012
I'm trying to create a vpc between a Nexus 5010 and Nexus 5020 switch. I recently upgraded the software so they are running the same version. I connect get a vpc link. Is there something wrong with my setup? Is a vpc between a 5010 and 5020 even possible? They are connected using a pair of Intel X520's in 802.3AD teaming mode. [code]
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Apr 19, 2013
I have a pair of Nexus 5548UPs that have some high priority servers running on them. Servers are ESX hosts running Nexus 1000v's. Each host has multple connections in a VPC to both 5548s. We have been having intermittant ping loss and slowness of traffic to the VM's on these hosts. I was poking around trying to figure out what the issue could be and found that the peer-keepalive command was not set to send the heart beat across the mgmt0 interface. I would like to change this to point it accross the mgmt0 interface. Any tips or advice for me on making this change with production servers running on the switches? I do not want to cause any loss to any systems when I make this change. [Code] ..........
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Mar 13, 2013
how the Nexus 5500s work ?currently we have two 6513 Core switches 6513-1 and 6513-2 running HSRP and RSTP. 6513-1 is currently the Root Bridge, 6513-2 is setup as our secondary root. We also have two 5548UPs setup with a peerlink between them. Picture attached. "Current Setup.jpg"
There is a 20gig port channel between the 6513s and also a 20gig port channel(peer link) between the 5548s. 5548-1 has a 10g fiber running back to 6513-1 and 5548-2 has a 10g fiber running back to 6513-2. Currently now Spanning tree is blocking the link from 6513-2 going to 5548-2 which is what we expect. We were working on moving some things to different racks the other day and moved switch 5548-2 to another rack and brought it back online without the peerlink fiber connected. We started to have issues and tried to plug the peer link back up, but still continued to have issues. We started to troubleshoot and noticed that both 5548s were acting like the master of the VPC domain and was not letting traffic pass accross the Peer Link. We then rebooted the 5548-2 with the thought that it would come back up as the secondary in the VPC domain. When it finally finished booting back up it then caused a huge loop in our network accross both uplinks to the 6513s and the 5548s peer link which in turn took our network down. Spanning tree did not work like it was suppose to and block the port going from 6513-2 to 5548-2 in time.
My thought was this didn't seem like a good setup. I went to the drawing board and decided we needed to have an uplink from both 5548-1 and 5548-2 going to 6513-1 setup as a port channel/VPC and also a uplink from 5548-1 and 5548-2 going to 6513-2 setup as a port channel/VPC. Picture Attached. "NewSetup.jpg" We are also planning on buying a "2K-C2224TP-1GE" to hang off the 5548s to use for ethernet.
how the Nexus 5ks work and haven't done a lot of research on them. Would this not be a better setup since both switches will have an active link to the root bridge? The links from the 5548s going to 6513-2 should always be in a block state until we loose both uplinks to 6513-1 or the entire switch itself correct? Also how will the 5548s reactive if I was to loose the Peer link fiber? Will they continue to work as normal? When it looses this Peer Link does it suspend all the VPCs for the servers on the secondary switch in the Domain so the network doesn't get confused on which link to send traffic up since there isn't a peer link active or is this not the case? Also with the peer link down will the 6513-1 know which 5548 to send the traffic to if there is only 1 device (not setup in a VPC) on one of the 5548s? What are your recommendations/best practice on the setup for the 2k?
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Feb 11, 2013
I have 2 hosts, 1 plugged in fa 0/21 in VLAN 101 and another in fa 0/22 in VLAN 101 on our L2 Cisco 2960. If I try and transfer files from either host the gig 0/1 trunk port on the 2960 leading tot he 3750 fa 0/1 port hits 100mb (using a real time bandwidth monitor tool), but why? This VLAN is on the same switch, why does it go one way up the trunk to the L3 3750 switch? The L3 3750 is the VTP server and the 2960 is a client. I would of thought the traffic stays local. The 2 hosts don't even have a gateway set.To sum up the typology the 2960 and 3750 are trunked using a single cable. The 3750 hangs of a ASA firewall using SVIs.Here is whatthe traffic looks like when copying a file between hosts (2gb file).
3750 L3 Switch (VTP Server)
interface FastEthernet1/0/4
description Trunk to Cisco 2960 Gig 0/1
switchport trunk encapsulation dot1q
switchport mode trunk
switchport nonegotiate
[code]....
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Oct 10, 2012
Have a quick question regarding inter-vlan routing on a 3750. Overview of network is ISP --> ASA --> 3750 (acting as my core and default gw). I have 5 vlan interfaces on my 3750, all w/ 192.192.x.x subnets, a 6th w/ 192.168.100.x, and a 7th w/ 192.168.200.x. I have enabled "ip routing" on the switch and can successfully ping from subnet A to subnet B as long as both devices are using the correct DG for their vlan, which is the switch. I have a few ports that are trunked as well that go to ESX hosts which break out the vlans according to the subnet the vm should be attached to. The ASA is set to nat internal traffic for all the vlans.
Now my question: short of applying an ACL to each vlan interface to block traffic from other 192.192.x.x subnets is there a better way to accomplish this? I want my 192.168.10.x subnet to be able to reach all the subnets, but don't want 192.192.10.x to be able to talk to 192.192.20.x for example. I was thinking to create an acl like this:
access-list 120 permit ip 192.192.10.0 0.0.0.255 access-list 120 deny ip 192.192.0.0 0.0.255.255 192.192.10.0 0.0.0.255access-list 120 permit ip any 192.168.100.0 0.0.0.255 192.192.10.0 0.0.0.255
and then applying this to the interface for the appropriate vlan.
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Jul 17, 2012
I have problems in my Cisco network until I connected some Moxa devices.This Moxa are models EDS-316 and EDS-208
My principal trouble is the traffic UDP. Suddently the network don't permit the traffic UDP in VLAN where are connected Moxa devices.
During an hour the Moxa can send TCP traffic, but can't send UDP. If a Moxa device is unplugged from network, all devices connected to him can work offile from principal network, but if I plugg again the Moxa is like disable.
After one hour (more or less) the system restart all functions and work fine.I catch the logs from TXerrorsInPorts and all the ports where is connected a Moxa have errors all time.
I don't know which is the problem, but I think that problem is in negotiation from Moxa to Cisco.This is the configuration from a port where is connected a Moxa: [code]
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Jun 14, 2012
I have a requirement to monitor all traffic going from the internal LAN to the cloud. The LAN is a layer 2 VLAN which spans multiple Cisco 4507 switched and other smaller switches.
The VLAN has an IP address which the hosts use as the default gateway.
The exit port is on a Cisco 3600X switch connecrted to 4507 #1 via a 10G fiber link. 4507 #1 connects the rest of the LAN. Those switches interconnect via 10G fiber and 1G copper links.
Currently the monitor host is connected to a 1G copper port, configured as a monitor port, on one of the backside 4507s The switch manager says he has the switches configured so that I can see all traffic on the VLAN.
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Apr 11, 2012
We have a switch gc2960. It has ports configured on vlan 27 and vlan 29.It is connected to switch ch3550. It has presence of vlan 27 vlan 29 and also vlan 18 and several other vlans.Our internet firewall is connected to ch3550. It is a fortinet product, so this is not indicated on the diagram.
When the two switches were connected on vlan 29 access ports, pc's on vlan 29 on gc2960 worked as expected. vlan 27 clients of course did not work.When we switched the connecting ports to trunk ports, some weird stuff happened. Clients on gc2960 on vlan 29 could ping and resolve dns, but not browse the intenet. The same was true for clients on gc2960 vlan 27. We verified that packets from the web were coming in through the firewall. What we were thinking, is that they somehow were not being tagged to vlan 29 even though we were trunking.
When we set native vlan 29 on the trunk, then clients on gc2960 vlan 29 operated as expected. However, clients on gc2960 vlan 27 are still having this problem, we can ping and resolve dns but not browse.Consider the other switch ch2960-jstreet which has presence of vlan 18 and vlan 27. It is also connected on trunk to ch3550. We are not using native vlan on this trunk, and traffic works as expected.Is the lack of presence of vlan 18 a factor as to why gc2960 is not receiving the tagged packets correctly? Should the interface vlan18 on gc2960 have an ip address on the vlan 18 network?
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Nov 27, 2012
I want to know what is the best way to black traffic inside the same VLAN, this VLAN is a user VLAN, it means that I am talking about access layer.I wanted to use private vlan, but C2960S doesn't support this feature. Any other way to prevent any to any traffic in the user vlan, this vlan only have to speak at the Layer 3.
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Jan 24, 2012
At present we are having a 4900 series switch where we are running one monitor session.Additionaly we are in need of capturing VLAN traffic and set the destination to 2 * GE ports , both are in the same switch.Due to the limitation of two monitor sessions per switch , we thought of putting the destination ports as port channel but it looks like it is not supported.
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Feb 21, 2013
I have One switch 3750 and many switch 2960 c.I use one ASA 5510 to reach emote branche site (vpn conexion).I use one router 1841 for internet conexion.Router 1841, ASA and catalyst 2960 are connected on the 3750.Default gateway of all user is ASA IP
I configured Vlan 3750 and it work.Now I need to implement security : permit/block specific traffic between vlan [code] From vlan 72 I cannot have remote access on computer in vlan 34 and I cannot ping computer in vlan 34.
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Jul 5, 2012
We run a network of several 2960G and 3650G switches in a network with a number of VLANs. One one particular VLAN (let's call it VLAN 10) it appears that non-broadcast traffic (i.e. normal unicast traffic) is being copied to every port in VLAN 10 only on one switch . The traffic is not crossing trunk ports and does not appear on other switches that have ports in VLAN 10. We first spotted this by noticing that a UPS port had an unusual amount of activity on our port througput graphs:
This traffic at 4 am is not expected and this profile is repeated across all ports in VLAN 10 on this switch (a WS-C2960S-48TD-L stack running IOS 15.0(1)SE3)\iffed one port using local SPAN (the UPS port) and discovered that this traffic was not broadcast, which was running at a normal low rate at all times. The traffic appeared to be unicast traffic from other ports of the sort you might see on a hub. It was from various hosts that live on VLAN 10, most (not all) of the conversations had one end station homed on the 'problem' switch. There are about 800 non-broadcast packets per hour and this is a busy VLAN so it does not account for all the traffic on the VLAN.
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Nov 27, 2011
We have a pair of 6509 working in a VSS configuration (IOS 12.2(33)SX5). The 6509s connect to a pair of ASAs (7.2 code) running in an Active/Standby setup. These ASAs in turn connect to routers going to remote sites. I have configured Netflow on the following VLANS,
VLAN 10 - Servers Vlan
VLAN 9 - Transit/ASA VLAN (connects ASAs to 6509s). All traffic originating from any VLAN on the 6509 crosses this VLAN in order to reach remote sites and vice versa
I configured the netflow source VLAN 11 although I am not collecing any netflow from it.Although I have been getting lots of Netflow info, I noticed that netflow for traffic originating from any user VLAN on the 6509s going to any remote site via TRANSIT/ASA VLAN(9) does not get reported, I even tested with 4 GB traffic but no result. Only reverse traffic (i.e. from remote site to user VLAN) is reported as it traverses the Transit VLAN (9).
I read somewhere that egress netflow is not supported in 6500, but isnt traffic originating from a user vlan to a remote site via the transit VLAN (9) considered ingress with respect to the transit VLAN (9)? I would like to know whether bidirectional Netflow is supported on 6500 VLANS. I have mimimum control on routers beyond the ASAs, and since these ASAs run 7.2 code netflow is not supported, and Monitoring this Transit Vlan gives me extremely useful info.
I do get netflow biderectional traffic from the Server Vlan 10, but I think it is correlated by the netflow collector from vlans 9 and 10. [code]
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Nov 13, 2011
I am trying to setup a network using Cisco 2960 switches with vlans configured. One vlan will handle video coming from four cameras that are connected to another 2960.
We have four cameras feeeding one port each on a 2960, that 2960 in turn feeds one port on the main 2960 which is the video vlan for that site. From the site it goes back to a Cisco 3750 to be sent over to a Sonicwall firewall. If we connect to the 2960 that the camera are connected to we can see the video, but not on the main site 2960.
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Dec 18, 2011
I'm decommissioning my SonicWall PRO 3060 and upgrading to an ASA5550 (we're increasing our WAN link speed to 1Gig and need the 5550). In any case, I want to copy over the configuration from the PRO to the ASA. I have everything documented and I've started doing the changeover, but in looking at some other network diagrams on the net I'm seeing router symbols between the LAN switches and the ASA and I'm beginning to worry that I might need routers to do this which, of course, would increase cost quite a bit.
So my question is this: If I have a core switch carved into multiple VLANs and I connect each VLAN to a port on the ASA, will I be able to route and filter traffic from VLAN to VLAN through the ASA? If so how, in general, is this accomplished (I'm betting ACLs). I think that the ASA will be able to do this easily, but I just want to be sure before I get too far into the configuration of this unit,.
ASA
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
GigE0/0 GigE0/1 GigE0/2 GigE0/3 GigE1/0 GigE1/1 GigE1/2 GigE1/3
| | | | | | | |
| | | | | | | |
WAN BackupWAN VLAN400 VLAN500 VLAN600 VLAN700
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Mar 28, 2013
We recently extended our access layer using a pair of 5ks with extenders. We have a pair of 6509s at our core and they handle the intra-VLAN routing with SVIs. I recently noticed that access hosts connected to the extenders cannot pass traffic between each other if they are in different VLANs. The strange thing is these same hosts can ping devices in other VLANs as long as the other devices are not connected to the 5k environment.
For example, consider the following hosts. Each host has their gateway set to the appropriate SVI on our core.
HostA - VLAN100 - connected to 5k extender
HostB - VLAN200 - connected to 5k extender
HostC - VLAN100 - connected to 2960 off our core
HostD - VLAN200 - connected to 2960 off our core
Each host can ping each other with the exception of HostA and HostB. As for specifics, we use HSRP (no VSS) between our cores.
When I ping between hostA and hostB, I see the egress packets on either 5k1 or 5k2. I then see ingress AND egress on Core1. There are no ingress packets on 5k1 or 5k2.The egress packets from Core1 show the correct destination MAC address of the target host. The mac address table shows the mac address on po31.
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Jan 3, 2013
I have 2 Nexus 5596UPs with a layer 3 cards that are exhibiting some very peculiar behavior. The systems are running 5.1(3)N1(1).I have configured 2 VRF contexts each running their own OSPF process. There is a static gateway of last resort configured on each VRF, which is to an upstream pair of 5585X's in Active/Active. Each OSPF process has the "default-information originate always" command configured, however, backbone neighbors are not recieving a gateway of last resort from the 5596UPs. The applicable configurations are show below. All other routing information is passing correctly between devices in the network. This network is not production, it is a proof of concept for a larger implementation.
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Oct 23, 2011
Net flow on the Nexus 5596upI can't seem to find any information on the Nexus 5596 support of net flow. On Nexus 5596UP support of net flow ?
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Mar 19, 2012
We have setup a pair of Nexus 5596 L3 switches with 2 x 10Gbps LACP links between them to act as the vpc peer link. We also have another 2 x 10Gbps LACP links between the 5596 switches to carry non VPC VLANs, this is required to provide EIGRP routing between the switches and an upstream router.I have read that it is possible to setup the vpc keep-alive link over an SVI instead of the management interfaces. Is it ok to run the keep-alive SVI over the second LACP non VPC VLAN trunk or is it recommened to keep this seperate?
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