Cisco Switching/Routing :: Dynamic ARP 3560 Inspection On Single Vlan
Apr 22, 2013
I have enabled IP DHCP snooping on a 24 port 3560 switch (v small office) and let the database fill up, now I have added dynamic arp inspection on the single vlan and I amd getting these errors.
Apr 23 16:15:34: %SW_DAI-4-DHCP_SNOOPING_DENY: 1 Invalid ARPs (Req) on Fa0/5, vlan 1.([5835.d9b0.b9d1/172.30.5.2/0000.0000.0000/172.30.5.3/16:15:33 BST Tue Apr 23 2013])
Apr 23 16:15:39: %SW_DAI-4-DHCP_SNOOPING_DENY: 1 Invalid ARPs (Req) on Fa0/8, vlan 1.([0004.f2be.55e4/172.30.5.5/0000.0000.0000/172.30.5.8/16:15:39 BST Tue Apr 23 2013])
Apr 23 16:15:40: %SW_DAI-4-DHCP_SNOOPING_DENY: 1 Invalid ARPs (Req) on Fa0/8, vlan 1.([0004.f2be.55e4/172.30.5.5/0000.0000.0000/172.30.5.8/16:15:40 BST Tue Apr 23 2013])
[Code] .....
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Jun 14, 2010
We have ip arp inspection and dhcp snooping enable in couple of 3750 and 3560 switches. Everything works fine, excepted few case that DAI packet rate trigger and errdisable the port. Later on we found out that most of computer that trigger DAI is Windows 7 and especially when they are in sleep mode. Not sure if anyone experiencing it with Windows 7. Also we have it rate limit at 64.
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Jan 10, 2012
Between our hosting and a customer we have an extended vlan, traveling on a fiber, between two cisco 3560 switches.The thing is, that we want to create one or more vlans inside that extended vlan, in some way if possible?
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Jun 27, 2012
I got a different scenario from one of my client.My client have two different branch offices and have 50Mbps point to point connectivity between them. All users in both braches using same series of IP pool ( 192.168.224.0/24) in both branches.Both branches he had only Cisco 2960S series switches only. And in both branches he is using IP cameras. He will monitor the assets by accessing IP cameras through the browser.His requirement is, he wants to prioritize the Video traffic( monitoring through the browser) over the normal data traffic.Note: He had a single VLAN only.
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Mar 12, 2012
I would like to know if it is possible to assign a 3rd IP address to my end user vlan. Basically the 45xx acts as my end user gateway and has been confirgured as below
interface VlanXX
description Main Vlan
ip address 2.X.X.X 255.255.255.0 secondary
ip address 1.X.X.X 255.255.252.0
[Code].....
Here, due to IP address exhaustion in my end-user network, i want to add one more subnet X.X.X.X/22 to my network and assign one IP more from this range to the above vlan to act as the gateway IP.
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Feb 6, 2012
We have Cisco Cat4503 series L3 Switch and Cisco L2 2560 Series Switches, some of the users want to have a dynamic VLAN membership, and connecting with the network as mobile users,
can it possible and create dynamic VLAN for specific group of users.
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Dec 5, 2011
Is there any way to check if this VLAN is used by somedevice?
Cisco3560#sh ip int b
Vlan55 unassigned YES NVRAM administratively down down
Cisco3560#sh vlan
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active
55 Print active Fa0/5, Fa0/6, Fa0/7, Fa0/8
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Jul 22, 2012
I have 4 vlan and all has conectivity/access with all (VLAN10,VLAN20,VLAN30 and VLAN40, I use a 3560 Switch for this propose, I need to modificate one vlan (VLAN40) that has access to the rest of the VLAN's BUT the rest of the VLAN's dont have access to VLAN40. I know that it is a problem of access-list BUT I can't undertand how to obtain the result that I like
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Sep 15, 2012
I have 2 locations, at a distance of 600KM.These two locations are well connected by Point to Point L2 VLAN with a speed of 2 MBPS and supported by CISCO 3560G switches.Location A has a VLAN to communicate to the other VLAN at Location B. Location B has also got 3 VLANS which are inter connected with Location A.Now the hardware in one of VLANs in Location B has moved to Location A for obvious reasons.
For further refernce am giving the VLAN IP address here....
Location A
VLAN1 for communicatng to Location B
IP Range 172.20.44.210
Subnet Mask 255.255.255.0
Default Gateway 172.20.44.210
VLAN2 for the desktops in Location A
IP Range 192.193.194.1-255
Subnet Mask 255.255.255.0
Default Gateway 192.193.194.1
[code]....
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May 8, 2012
I have an environment of 3 X 3560G of which I have 1st switch-CORE(f0/10) connecting to the VPN router(CE) interface-f0/0. Remaining 2 Cisco 3560's(Access) are connected to Gi0/1 and Gi0/2 on the 1st switch-CORE via gi0/1 . On all three switches I have created multiple VLANs and assigned ports to these VLAN. The switch to switch connection is trunk allowing all VLANs created on all these 3 switches. Now the issue is how I am going to have all these VLANs routed through single interface on the routeri-e f0/0, as all these subnets will communicating to remote site over VPN. What should be default gateway on the 2 Access switches and the CORE switch, also what static route should be on router to reach all subnets(VLANs) created on these 3 switches.
I have read inter-VLAN routing i-e creating sub interfaces on router but dont want to proceed with that and looking for any other way to have my VLANs talk on all three switches and then are accessible to remote site ove VPN?
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Apr 28, 2012
We recently purchased Cisco 3560X Layer3 Switch. We need to perform simple Inter VLAN routing. We have configured VLAN1 (name-server_vlan) and VLAN2 (name- user_vlan). We have also assigned the Ports and IP address to both the VLANs. After assiging this if we plug Laptop A into VLAN1 then it doesnt communicates with Laptop B (btw, Laptop A is able to Ping VLAN2 Gateway ) in VLAN2 but on the other hand Laptop B is able to communicate with Laptop A and ping everything i.e. Gateway of VLAN1.
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Sep 17, 2012
We are currently using two Nexus 5548UP's as our Datacenter Network Core. I have a pretty simple objective: I would like to enable Jumbo Frames on a single VLAN only(VLAN 65). This VLAN is used strictly for backups. I do not want to enable Jumbo Frames on the other VLANs(VLANs 1-10). Im not sure what the best way to do this is.....or if it is even possible but I am hoping to get some configuration examples.
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Mar 18, 2013
I have a 3560 switch with 1 VLAN (VLAN 10) where I need to make ports:
1-10 as isolated (can't contact each other)
11-20 as community (need to contact each other like a normal VLAN)
23 as promiscuous (server that ports 1-20 need to get to)
24 as promiscuous (WAN router where ports 1-20 need to get to and the remote servers).
[Code]...
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Jan 16, 2013
Topology: 3560 <-access-mode-link-> ASA5510 - Internet,3560 has 3 VLANs and 3 corresponding SVIs (default-gateways for VLANs),Just configured RAS VPN on ASA5510 and successfully made connection,Now, from RAS VPN (IPSEC) client workstation CLI, can ping all 3560 SVIs,CANNOT PING host devices plugged into switchports.
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Dec 27, 2011
In my lab setup i configured Cisco 3560 switch.
-VLAN 20 and VLAN 30 i configured.
-VLAN 20 interface IP : 192.168.20.1/24
-VLAN 30 interface IP : 192.168.30.1/24.
Inter-vlan communication is happening fine. For testing for purpose i configured extended ACLs.i want stop communication from VLAN 30 to VLAN 20 but not vice-versa. If i ping from one of the IP VLAN 20 to one of the ip of VLAN 30, i was gettng Requested time out. And if i ping from one of the IP VLAN 20 to VLAN 30 interface IP, i was able get pinging.From VLAN 30 to VLAN 20, i was getting destination host unreachable from VLAN 30 ip( Its fine as its my requirement)So, solution needed to communicate from VLAN 20 to VLAN 30.
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Apr 18, 2012
I have a 3560 switch with the following ports config [code] I would like to use theses ports on a different vlan to connect 4 pc's to them. Can I just remove them from the vlan, remove the trunk switchport and set up on the vlan i want them on with no trunking?
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Apr 19, 2012
Probably an easy fix but something's weird in my config. I am setting up a new network, so this is not production, Routed environment, down to the access layer using 3560-x l3 switches.
vlan 10: data
vlan 20: wifi
vlan 30: wifi guests
vlan 40: voip
My objective is to allow all traffic OUTBOUND to certain subnets (10.10.0.0/24, 10.10.100.0/24, 10.10.110.0/24 10.10.120.0/24) and block any other 10.0.0.0/8 networks. By doing it this way, after blocking all other internal traffic, I allow everything else to ensure internet traffic can go out.
Extended IP access list VLAN10_TRAFFIC_FLOW 10 permit ip any 10.10.0.0 0.0.0.255 20 permit ip any 10.10.100.0 0.0.0.255 30 permit ip any 10.10.110.0 0.0.0.255 40 permit ip any 10.10.120.0 0.0.0.255 50 deny ip any 10.0.0.0 0.255.255.255 (5 matches) 60 deny ip any 172.16.0.0 0.0.255.255 70 permit ip any any!interface Vlan10description DATAip address 10.104.10.1 255.255.255.0ip access-group VLAN10_TRAFFIC_FLOW outendThe problem is, from the above info, when I ping 10.10.0.5 from a workstation in VLAN 10, it should match rule 10, but instead if matches rule 50 (as shown by the 5 matches)
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Aug 6, 2012
When did this wonderful feature get introduced? Is it going to moved down to the 3560s/2960s type switches?
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May 21, 2013
I faced the ( receive discard vlan 20 of Cisco switch 3560 ) on my Solarwinds Server .
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Apr 17, 2012
We have over 30 Cisco 3560 switches and over 10 VLANs on our network. In our example, VLAN 10 on switch IP 10.0.20.150 works fine and VLAN 10 on switch IP 10.0.20.24 doesn’t work. The below are both switches show vlan. url....I can’t tell what causes the problem and how to fix it. VLAN 10 on Switch 10.0.20 24 doesn’t work. [code]
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Jun 20, 2012
I'm configuring two etherchannel groups (2 ports in each) on a 3560 switch. I need to trunk multiple vlans over each channel group.
I created the vlan trunks and allowed vlans on each physical interface. I notice that I can also configure the vlan trunks on the port-channel interfaces that were created. Should I configure them under those interfaces, or leave them on the physical interfaces? Relevant config is below:
interface Port-channel1
!
interface Port-channel2
[Code].....
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Jun 3, 2012
We have two Cisco switches with one 3560 and one 3750 we have created a new Vlan 4 with IP 10.1.3.x 255.255.255.0 - no shut then assigne to gi 2/0/46 on the 3560 Vlan 4 ip address 10.1.3.x 255.255.255.0 no shut then assign to FA0/45. All interfaces are up up along with the Vlan up up, we can ping the local IP address bu not able to pint the other switch.
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Jan 12, 2010
I have a HP Procurve 5406 connected to a Cisco 3560 on a temporary cat5e connection and I have Mitel IP phones needing to go on the Cisco switch.Ive configured the HP Procurve port to TAGGING both VLAN 10 (data) and VLAN 20 (Voice). NO is selected for default VLAN 1.The Cisco is configured on the port with switchport encap dot1q and switchport mode trunk.
Ive configured an IP for interface VLAN 10 and i cannot ping it from across the network. The interfaces are up and happy. I have tried changing the VTP status from transparent to server (VTP pruning is off) ive tried setting allowed vlans 10,20. Still not a think. The worse thing is that i have a working Cisco switch with the HP procurve that i checked the config on and its the same! The only difference is that the media type is SX over SFP in that case.
p.s not that im at this stage yet but i initially configure the FastE ports as trunks with native vlans because i was using non-cisco phones. On a spare port i convigured the voice vlan 20 and i say on the mitel phone that it was looking on vlan20! I didnt expect that, i thought the Voice VLAN ID was carried on CDP enabled devices only.
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May 20, 2010
For many years we've had the following vlan and port security config on our 3560s: [code] This has worked great on 12.2(37)SE1, 12.2(40)SE and 12.2(46)SE. However since 12.2(50)SE, and I've tried all the versions since then, we have a problem with 7900 phones and ATA186s taking upwards of 20 minutes before they can get a valid IP number.The problem on the newer IOSes seems to be related to the inactivity aging.On the older IOS versions the mac address of the voice device appears on the voice vlan straight away.
On the newer IOS versions the mac address of the voice device appears on the DATA vlan and seems to be stuck there until the inactivity aging removes it. It then gets re-learned, sometimes on the voice vlan, and sometimes on the data vlan. If you're unlucky and it gets re-learned on the data vlan you've got to wait until the inactivity time ages the address out again. Repeat until the mac address eventually gets learned on the voice vlan. I don't want to be stuck on 12.2(46)SE forever.
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Nov 1, 2011
I've set up my 3560 to do routing. Now, I'm looking for a way to apply acl restrictions to the vlan interface ip address itself.
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Mar 6, 2013
How config dynamic alp inspection for 300 or 500 series ? I find in admin guide it's no simple to do.
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Mar 2, 2011
I have a network of 3750's configured for DAI with DHCP Snooping implanted and working with windows XP for around a year. Now we've changed a couple machines for windows 7. I have a floor with around 200 workstations on XP and about 4 on Seven.Two of these WIN7 are triggering the err-disable for arp inspection (configured by default to block interfaces sending over 15 arp pps) I noticed that when I go on windows -> network and I do a refresh, sometimes (most of the time after boot up or idle time) it will trigger the massive arp response on the network. I noticed that all hosts on the network updated their arp entry for that computer(win7) at the same time, for some reason I don't know. The windows 7 tries to reply over fifty arp requests for its IP which caused the port to be put on err-disable.There were no applications running on the windows7 computer at the time of the tests, only wireshark and its default services.This computer has configured:DHCP with WINS Its on a windows domain has netbios over TCP.
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Jan 2, 2012
I need to implement the shaping VLAN only on the trunk link between the 6500 and 3560. [code]
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Oct 11, 2010
Any way to test in a lab what would happen if a tech mistakingly added "switchport voice vlan XX" to a trunk port? I am try to do some RCA on an issue and this has been identified as a possible cause by one of my techs.
The config is Switch1------Switch2--------Switch3 Each interswitch connection is configured as a dot1q trunk with all vlans allowed. The link between switch2 and 3 is where switchport voice vlan 10 was added. Switch1 is a 3750 and 2/3 are 3560's.
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Jun 5, 2012
I need to allow traffic between webserver in dmz and mssql (Microsoft SQL Server 2008).MSSQL use dynamic port (now it is 63796) and this cannot be changed.
Basically, I can allow such traffic using next configuration:access-list dmz extended permit tcp host 1.2.3.4 host 5.6.7.8 eq 1433access-list dmz extended permit udp host 1.2.3.4 host 5.6.7.8 eq 1434 access-list dmz extended permit tcp host 1.2.3.4 host 5.6.7.8 eq 63796
But, I would like to add mssql inspection and I did the next:
class-map class_sqlnetmatch port tcp eq 1433policy-map global_policyclass inspection_default inspect dns preset_dns_map inspect ftp inspect h323 h225 inspect h323 ras inspect ip-options inspect netbios inspect rsh inspect rtsp inspect skinny inspect esmtp inspect sqlnet inspect sunrpc inspect tftp inspect sip inspect xdmcp class class_sqlnet inspect sqlnet service-policy global_policy global
[Code] ..........
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Oct 25, 2012
I'm new to networking and was looking for some assistance. First off im using packet tracer to diagram my senario as I will be receiving my equipment next week to deploy.
Hardware to be used:
1. 2 catalyst 3560 switches
2. all connect to a sonic wall router
I have two companies that work in the same office space. I need to keep these companies seperate on their own vlan. They will however need to share the phone system.(Packet tracer file uploaded to give those who have the time to see what I put together.) [code]
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Jul 11, 2012
I have a SG300-28P switch. I just read in the Administration Guide that, when in Layer 3 mode, the switch doesn't support MAC-based VLAN or Dynamic VLAN Assignment.
So, in order to assign a client to a VLAN based on their MAC or based on the response of a RADIUS server, we have to disable layer 3 features. Without layer 3 switching, the switch is unable to act as a default gateway and forward packets between VLANs. As a result, the VLANs can't communicate in any way, or access the internet, unless a separate router is connected to every VLAN. Right? Doesn't this limitation significantly reduce the usefulness of the DVA feature?
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Aug 20, 2012
I have an SF-300-24 port switch and am having an issue. When a device says "Who has 192.168.0.1" (which is the default gateway) two devices are replying in the affirmative, and therefor the MAC address table is getting screwed up. I know the correct MAC address of 192.168.0.1 is 00:1b:21:95:02:b0, so how do I tell the router to disgard any packets that say otherwise? I tried to figure out DHCP snooping and IP source guard, and ARP Inspection, but I am not getting anywhere and keep losing connectivity to the switch.
Obviously a device on the network is misconfigured, unfortunately it is a large wireless network and the misconfigured device is 30 miles away on the top of a mountain. I am hoping to bandaid it locally and then eventually go out and fix the offending equipment.
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