L2ptguard Error
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your peers, hundreds of CCIE's and INE's own team of world renowned CCIE instructors and authors, Brian Dennis - how to clear err disabled port Quintuple CCIE #2210, Brian McGahan – Triple CCIE #8593, Petr Lapukhov - Quad CCIE #16379, and Mark Snow - Dual CCIE #14073. Home CCIE Forums Forums » CCIE Forums » https://supportforums.cisco.com/discussion/10736211/l2pt-guard CCIE Routing & Switching Technical » l2ptguard error Latest post 07-18-2013 11:34 PM by andreibot. 29 replies. Page 1 of 2 (30 items) 1 2Next > Sort Posts: Oldest to newest Newest to oldest Previous Next 04-10-2012 10:28 AM andreibot Joined on 11-05-2009 Australia Professional Points 2,490 l2ptguard error Reply Contact Hello,--]I was working to one of INE labs and i had http://ieoc.com/forums/t/21344.aspx some problems regarding "l2ptguard error " with ports going into err-disabled because of "l2ptguard error ". After i finished the lab i tried to emulate that issue with another gear(real device) and i had the same problem.Topology looks like this:SW1--(f0/21,f0/22)---------(g0/21,g0/22)--SW4--(g0/23,g0/24)---------(g0/23,g0/24)--SW3--]A portchannel between Sw1 and Sw3 is configuredSw1:int f0/21, f0/22switchport trunk encapsulation dot1qswitchport mode trunkswitchport nonegotiatechannel-group 1 mode activeSw3:int g0/23, g0/24switchport trunk encapsulation dot1qswitchport mode trunkswitchport nonegotiatechannel-group 1 mode active--]On Sw4 tunneling is configuredSw4:g0/21, g0/23switchport access vlan 121switchport mode dot1q-tunnell2protocol-tunnel stpl2protocol-tunnel point-to-point lacpg0/22, g0/24switchport access vlan 122switchport mode dot1q-tunnell2protocol-tunnel stpl2protocol-tunnel point-to-point lacp--] Everything looks fine. However, on Sw4 i have all the time either g0/21, g0/22 or both of them into errdisable01:31:35: %PM-4-ERR_DISABLE: l2ptguard error detected on Gi0/22, putting Gi0/22 in err-disable state01:31:36: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/22, changed state to down01:31:37: %LINK-3-UPDOWN: Interface GigabitEthernet0/22, changed state to down--] I was reading about this topic several forums but i never really found an answer for this problem. Post Points: 35 04-10-2012 10:43 AM In reply to Phoenix Joined on 03-30-2012 Elite Points 6,370 Re: l2ptguard error Reply Contact do u read this? http://www.cisco.com/en
tunneling technology known as l2protocol-tunneling or L2pt here on the blog. If you missed that article, you may want to go through and get a handle on that technology before jumping into Q-Q tunneling. The two usually go hand in hand, but I cover them separately to show that they http://www.astorinonetworks.com/2011/12/13/q-q-tunneling-for-fun-profit/ are two independent technologies that just so happen to go nicely together. Today, we will look at Q-Q tunneling and a bit later we will show how to integrate L2PT with your Q-Q tunnels. What is the point of Q-Q tunneling you might ask? It is mainly a SP technology used in metro ethernet that essentially transparently connects different customer sites that connect into the metro ethernet cloud by "tunneling" their traffic through the service provider network. The cool thing about it is error detected that the tunneling aspect of the technology allows the customer to send as many VLANs as they need to while also keeping their traffic pretty much isolated from the SP core. How It Works I usually like to start with a diagram of what things look like. This helps me visualize what is happening. Take a look at this, and don't worry if you don't get why certain VLANs are where, we will deal with that. Let's just go with the general error disabled port concepts for now Here we have Cat1 at customer site A and Cat4 at customer site B. The customer has elected to connect these two sites together by means of a metro ethernet service provided by our little service provider here consisting of Cat2 and Cat3. OK, cool. The goal of the SP is to make Cat1 and Cat4 appear to be directly connected from their perspectives. The SP wants to be as transparent as possible, and they also require that they keep their traffic isolated and secured from the customer traffic. Well, how do we do that, and how do we keep the VLANs separated if the traffic from two different organizations needs to pass through the same set of devices. This is where Q-Q comes in. Q-Q works by double encapsulating ethernet frames with two 802.1Q tags, hence the name Q-Q (Q in Q). When you think about it, it works a lot like MPLS L3 VPN actually so if you are familiar with that topic, this may come easier for you. What happens is that the customer sends some traffic tagged with whatever VLAN it is they need. When the SP edge switch receives that traffic, it keeps that existing "inner" tag and adds a a second "outer" tag to the frame. The "inside" tag is the customer VLAN, while the "outside" tag is used to transport or "tunnel" the frame through the metro ethernet cloud. When the frame gets to the egress