1. AP is configured as PC and consider one CBR application is present between 1 and 3.
2. AP is configured as HC and consider one CBR application is present between 1 and 3.
In scenario 1 if PC has polled to STA1 then STA1 will start sending packets to STA3.
Here my doubt is that the packets will go via PC(AP) or directly to STA3, If the packets are going via PC then what is the need of sending via PC. Because POLLING to STA1 means giving right to STA1 to send the packets.In scenario 2 if HC has send CF-poll to STA1 then STA1 will start sending packets to STA3.
Here my doubt is that the packets will go via HC(AP) or directly to STA3, If the packets are going via HC then what is the need of sending via PC. Because POLLING to STA1 means giving right to STA1 to send the packets.
I have two switches: Nexus 3064 (ver 5.0(3)U1(2)) and Cisco 6509.The 6509:
1 x WS-x6708-10GE 8 port Ten Gig module version 3.5, firmware 12.2(18r)S1. 2 x sup 720's, with PFC3A. 2 x WS-x6348-rj-45 4 x WS-x6748-ge-tx
The IOS is ipservicesk9-mz 12.2(33)SXH8b.Both switches have been running fine for quite a while(not connected to each other). I then ran a fiber connection between port Nexus:1/48 and 6509:Te9/1.When I ping (of any packet size) from the Nexus to the 6509 @172.19.4.254, the 6509's CPU goes to 100%. On occasion, we will get 1 out of 20 packets back in the reply.I reduced the MTU size on the three 6509 parameters until the CPU stopped going 100%.The magic number is 4175 bytes. 4176 and higher == 100% CPU.I am willing to put the fiber link to 1500, but how does one change that for just one port on the Nexus? I tried and it refuses to set the mtu. I also tried to setup a new service-policy but that didn't seem to work either.The Nexus users are all jumbo frame users. The users on the 6509 are all 1500 byte frame users, except for one user on a 1 gig port (ws-6748-ge-tx) line card. It is this user whom would like jumbos.
I'm having some problems with a D-Link switch. I believe it's filtering the management VLAN frames, which is really strange. If you look at the graph, you can see that the D-Link is connected to three switches by trunk links. I'll just use the numbers set in red on the graph to explain what's going on, it's simpler to see.So when I'm connected either to switch 4 or switch 5 (or the others on 5's level) I can use the management VLAN (ID = 1) to connect to all switches above number 3 (including number 3) but I can't get to switches numbers 1 and 2.The only way to connect to those switches is to either connect directly to one of their ports attributed to VLAN 1 or by connecting directly to switch 3. So that's why I concluded that switch 3 filters VLAN 1 frames. It's not switch 4 cause I can get from 5 to 3. But at 3, the frames stop.Also, this only happens for VLAN 1. We have some VoIP phones connected to switches 1 and 2 and their frames can communicate anywhere in the network.
We nave a new DCS-932L, and a several month old DCS-930L, both with latest firmware.I have set up both the same, enabled Motion detection across the two middle horizontal bands (fully across); no email; ftp enabled; Video set to 1 fps, quality="high", java.The DCS-932L seems to ignore the frames per second settings; motion brings several seconds of 15 fps, generating maybe 50 image files in a burst.The DCS-930L on the other hand also seems to ignore the settings in the opposite direction, and sometimes has trouble providing even one complete frame.
What am I missing - can't get my new SG 200-08 Switch to handle Jumbo Frames
I have set the MTU size to 9216, saved the conf. and rebooted the box - however when I try to "ping -f -l 8000 xxx.xxx.xxx.xxx" through it (or to the switch itself) I recieve only "Request timed out"!?
I have tried MTU=9000 as well.....
F/W: 1.0.1.0
Is there anything, apart from increasing the MTU size, that needs to be done?
I've to enable it on 3750 and nexus 7K switches. what are the steps involved? can we enable jumbo frame per port instead of enabling globally? i.e. we will only have few ports that will be using jumbo frames, rest of the ports will be using default 1500 MTU size.
We have a brand new 2 x 3750-X stack running 15.0(1)SE3 with C3KX-NM-10Gs installed in each switch. An HP C-Class server enclosure with Virtual Connect Flex-10 modules is connected to each of the 10G ports using twin ax cables and they seem to behave OK apart from some random packet drop which appears to be within the enclosure and not without.
However, when we were investigating this, we found a little oddity ... even though we have jumbo frame support enabled on the 3750-Xs, we are getting a significant "Valid frames, too large" received count on the interface, and a "Too large" transmitted count. I've looked around and can't find a definitive reason for this count to go up - it doesn't seem to be a jumbo frames thing, more an unexpected-additional-field-in-a-header type thing, like when you have a V LAN tag in a DTP frame. Any thoughts as to why I might be getting these from a new server enclosure?
SW-STACK-CORE-3750X#sho int t2/1/1 controller TenGigabitEthernet2/1/1 is up, line protocol is up (connected) Hardware is Ten Gigabit Ethernet, address is a44c.116e.55b5 (bia a44c.116e.55b5) [ code]....
We have a requirement to send span traffic to a destination port for monitoring purposes on two 5000s with some 2000 fex boxes attached. Some of the servers are making use of frames larger than 1500. we have not changed any mtu configuration on the 5000 since installation, and I can see the policy maps is still on 1500.
My first assumption would be that frames larger than 1500 will not be dropped, but it seemingly not (see below). is there a reason why the switch would forward jumbo frames? Also, is there a limitation on MTU for span traffic? There is a MTU command under the span session, but the maximum is 1518. From what I can read the frame will be truncated if it exceeds this. Does that mean the fragments will be dropped?
I believe i've enable jumbo frames on our Nexus 7010, one in each data-centre.
system jumbomtu 9216. Also on the interfaces mtu 9216. And can see MTU 9216 bytes, BW 20000000 Kbit, DLY 10 usec on the port-channel between them. Though when i ping between vlans at each site with large packets i get 30% drops and if i set the DF bit in IP header to yes - 100% loss.
8798 bytes from 10.200.12.2: icmp_seq=19 ttl=254 time=8.024 ms --- 10.200.12.2 ping statistics ---20 packets transmitted, 14 packets received, 30.00% packet loss
I understand that jumbo frames need to be enabled end-to-end. I have two ESX hosts connected at each site. I want to enable jumbo frames for those ports, but what if not all host on the ESX are using jumbo frames, will I have drops and connection failures? So if i have two sites, each with a 6509 connected via a trunk and need to enable jumbo frames for a vlan between the sites how do I accomplish this?If I enable jumbo frames on the trunk link how does that impact other traffic between the sites?
I have a Cisco Nexus 3064 that I am using as part of a flat network for the Lab. I have 30 Virtualization Servers(MS HyperV and VMware vSphere) connected to this switch and I want to enable jumbo frames. The Virtualization Servers are able to ping the local VM's using 8K bytes. However I am unable to ping from server to server using 8K bytes. I have configuration (in abbreviation). All the servers are in the same network which I configured as L2 ports with the "switchport" command. However, the interface "MTU" command is unavailable in L2 mode. I am only able to get the interface "MTU" command only in L3 mode with the "no switchport" command on the interface.
# int eth1/2-45 # no switchport # mtu 9216 # no shut
I can ping the servers with less than 1500 bytes, but anything larger fails.
I have a Cisco Catalyst 3100 blade in a Dell server chassis that is trunked to a 6509.
When doing a protocol capture, I see large frames being sent from one of the servers in the chassis.
Example:
TCP:[Continuation to #1701] [Bad CheckSum]Flags=...AP..., SrcPort=HTTP(80), DstPort=2667, PayloadLen=2831, Seq=1489611217 - 1489614048, Ack=1719592331, Win=65535 I see lengths up to 6900+ bites coming from the server.
The switch has the global MTU set to 1500
system mtu routing 1500
and I can't seem to set this at the interface level. The server is configured to send 1500 length frames. Why am I seeing these jumbos? (the server is Windows 2003)
I have a pair of Catalyst 3560 GB switches that are trunked with two of the standard ports, and that have trunk ports connecting to a failover pair of PIX 515e's. We're considering adding a pair of cluster database nodes and an iSCSI SAN, both of which would need a dedicated interconnect VLAN that I'd like to employ Jumbo frames on. I don't necessarily need the VLANs to traverse the firewall trunks since they're private interconnects, but I need each host to traverse the switch trunks.
Since it seems I can only enable Jumbo frames on the entire switch (current standard frame size is 1500 and jumbo is also 1500), when I enable it what kind of possible negative impact could this have on my trunked ports as well as my host connections? I've read mixed reviews of users with iSCSI SAN devices seeing terrible performance when enabling jumbo frames so I'm apprehensive about enabling them on an existing network.
The server team has asked me to implement jumbo frames on a single VLAN, the one they use for v motion. We have two pairs of 5548s, each pair running VPC for most connections. I am aware of many postings that describe how to enable jumbo frames globally, like this:
policy-map type network-qos jumbo class type network-qos class-default [code].....
I am not clear how I can extend this principle to one VLAN only.
Also, I am aware of a posting [URL], that shows some pitfalls of implementing jumbo frames in a VPC configuration. Pretty well all my connections are VPC, including all the FEXes, which are all dual-homed. In many cases, the VPC extends through to the servers so that the servers run port.channels across two FEXes. I am unclear whether the pitfalls are still valid, or whether I have to wait until my next maintenance slot (6 months away) to implement jumbo frames. Can jumbo frames be implement safely on the fly? How does enabling jumbo frames fit in with "conf sync" mode?
I've enabled jumbo frames in Networking -> LAN (Local Network) -> Jumbo Frames on an RV180W running the base firmware (1.0.0.30).The switch seems to pass jumbo frames just fine (like ... almost every switch these days), but the router itself silently drops jumbo frames.ss this a known bug?This makes enabling jumbo frames on clients impossible, since it will break some external connectivity. (I.E. when two endpoints are on networks with jumbo frames, they will then negotiate a high MTU over the WAN, but the router will silently drop large frames and they won't get an ICMP Fragmentation Needed, etc. because the router simply drops large frames).
We have a number of sites which have high-speed L2 links which terminate on our L3 switches at each site. The ports are between the sites are placed in routed mode.
I would like to use Jumbo frame between two of the network which will communicate across sites and 1500 mtu on the rest, is this something which is possible?
From my understanding is the mtu is set on the interface therefore if I set the mtu on the L2 link ports on both sites to 9000 then would this cause a problem for the 1500?
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.
I have a problem with x4648-rj45V+E module, which is not forwarding frames/packets in my 4507E switch. I have done the diagnostic and the module test is passed. When i try to ping from one PC to another in the flat network, icmp is not forwarding. Even i cannot see the mac addresses in the mac address-table. But i can ping to my management port in the sup module?
I attempted to enable jumbo frames on a Nexus 5010 (NX-OS version 4.2(1)N1(1)). I created the policy map below and lost access to the switch.
policy-map type network-qos jumbo class type network-qos class-default mtu 9216
After recovery I see from the logs that all vlans and interface were suspended. I've attempted to look for reasons for a compatibility issue but I am unable to find what is checked and what could have been incompatible. The other troubling thing is the adjacent switch suspended its interfaces too but no change was done there. What I need to look out for so that this does not happen again?
2011 Nov 22 23:43:09 phx-ipcg1dwfcma %ETHPORT-3-IF_ERROR_VLANS_SUSPENDED: VLANs 1,10,601 on Interface port-channel1 are being suspen ded. (Reason: QoSMgr Network QoS configuration incompatible) 2011 Nov 22 23:43:09 phx-ipcg1dwfcma %ETHPORT-5-IF_TRUNK_DOWN: Interface port-channel1, vlan 1,10,601 down 2011 Nov 22 23:43:09 phx-ipcg1dwfcma %ETHPORT-3-IF_ERROR_VLANS_SUSPENDED: VLANs 10 on Interface port-channel508 are being suspended.
I currently have 4 3560 switches connected in a Mesh topology. These are all set to use Jumbo Frames and so are all the Servers that are connected to these.I now need to connect a 2950 switch to 2 of the 3560's which will have only desktop computers connected to it but i do not want to configure Jumbo Frames on this and any of the desktops.
Can any ASA 5500 in particular the ASA5510 firewall support jumbo frames (i.e. greater than the default standard 1500 Bytes frames)?. I plan to use the ASAs to setup a point-to-point IPSec tunnel and need an Application frame of 4Kbytes intact and not segment it.I have done little checking on the Cisco Website and see it mention of Jumbo frames on the 5580 on 10Gig interface but didn't see mention 5510. 5580s are way over-kill and expensive for what I need is to run a mission critical one IPSec point-to-point with maximum of no more than 100Kbps so 5510 is perfect for me but not sure if it can carry the jumbo frame?
On the routers and switches it's the MTU settings and they are configurable per interface and I am OK and the circuit is T1 which the Telcos said it's OK since it's physical layer so the only unkown is the firewall.
I got an ASA 5510 system currently in single context mode, with CSC SSM installed. Single ISP uplink to internet, no VPN. And now customer would like add another ISP uplink, without invest another box for HA.What come across my mind is make the current box into multi context. There's some area i need to concern and also need yours perspective on it.
Question 1: For making the firewall into multi context, am i need to do it from scratch, issue mode multiple command. Then rebuilt the current production config into one of the context, then another context meant for the new IPS uplink, and one admin context?
Question 2: For CSC -SSM licensing requirement, model ASA 5510 with security plus license is able to support 2 context. So if i split my firewall like what i mention in question, what exactly number of context do i own (admin, context A, context B)?
Question 3: For CSC-SSM module in multi context mode, so the management port of CSC SSM must attach at admin context?
Question 4: After configured all the policy and traffic to scan, how exactly i should do in order apply this policy to the interface? Should i only enable at admin context, then firewall service-policy rules, and apply it global, OR should i also do the same action on context A and Context B?
I am not able to connect to any webpages in normal mode, even after restarting i still have the same problem [However it works in safe mode with networking]. The network connections show that it is connected and the signal strength is excellent. I then have to keep restarting the laptop like 3 to 4 times and it works. Its kind of frustrating to keep doing this all the time and besides i am scared by restarting the laptop so many time can harm it.
We have recently converted 1 Cisco Lightweight AP 1041 to Autonomous mode for site-survey purposes. We now want to convert it back to lightweight mode.
I received the following info from Cisco's TAC and wanted to inquire further before I start reconfiguring the switch:
In a redundant Sup-6E setup, the following configuration is supported :
- 1 TenGig uplink on Active Sup and 1 TenGig uplink on Standby Sup - 1 TenGig uplink on Active Sup and 2 Gig uplinks on Standby Sup - 2 Gig uplinks on Active Sup and 1 TenGig uplink on Standby Sup - 2 Gig uplink on Active Sup and 2 Gig uplinks on Standby Sup
If you invoke shared backplane mode, the following configuration can also be supported:
- 2 TenGig uplinks(blocking) on Active Sup and 2 TenGig uplinks on Standby Sup - 2 TenGig uplink(blocking) on Active Sup and 4 Gig uplinks on Standby Sup - 4 Gig uplinks on Active Sup and 2 TenGig uplinks(blocking) on Standby Sup - 4 Gig uplink on Active Sup and 4 Gig uplinks on Standby Sup
Here's the command and information about the "shared-backplane" mode :- [URL]
Currently, we have 2 SUP 6-Es(Module 5 - Active and Module 6 - Stand-by) setup in a redundent mode. I am planning on changing the redundent mode to the shared backplane mode so I can use 2 TenGig converters to uplink 2 access-switches. We purchased 2 TenGig converters and here is how I am planning on using them:
1- One will be used to uplink to two 3750 switches(stacked) 2- One will be used to uplink to a 2960 using a Gig SFP
My questions are:
1- Do I have to install the 2 TenGig converters(4-Gig Uplinks) in the same Module? Or can I use one one in module 5 and the second one in module 6? 2- Will changing the redundant mode to the shared backplane mode require rebooting the switch or disrupt the funtionality of the other linecards?
i got a Dir-655 router and Dell 1501 wireless -N mini PCI card (802.11 bgn compliant). Router was set to mix mode but my desktop Dell XP8300 can connect only till G mode.
1) I search on web and some said that i need to set my router to N mode only for my desktop to connect to N mode. IS THIS SOLUTION CORRECT??
2) Another issue was my sis got other old brand latop which can only connect to B mode, if i set to N mode only, she won't be able to connect it right?
I have a KASDA KD318MI ADSL Router. But it doesn't have wireless capabilities so I use an another router, which is aforementioned DIR 635. When I configure it as DHCP and connect to internet manually, from my desktop connection, its ok.
But when I try to make a PPPoE connection on D-link, it won't connect. I am no expert on routers, but I am trying to learn. I tried everything. Factory reset, updating firmware, then factory reset.
[INFO] Sat Jan 31 10:41:52 2004 Discovering PPPoE servers for INTERNET PPPoE Session [INFO] Sat Jan 31 10:41:52 2004 Trying to establish INTERNET PPPoE connection [INFO] Sat Jan 31 10:41:42 2004 Log viewed by IP address 192.168.0.30
I Buyed a new laptop yesterday(24-04-2012) so original W7 and i updated everything incl drivers and everything was great and i let the laptop on when i Was going to sleep and my wireless and lan internet did fine.. But then.. when i wake up suddenly it tells "No Connections Are Available" and i cant find any wifi's anymore + lan does not even work, but the adapters are both working fine it says + they are up to date, the router is fine cuz i have lan on pc and wifi on samsung galaxy, everything about wifi is on incl the button on the laptop..I only have 1 antivirus or so program and i have a red cross @ network and sharing settings?Network adapters (They both work): Atheros AR9285 wireless adapter & Realtek PCIe GBE family controller (both newest drivers installed)
