I am having some difficulty understanding some trace route results that I am
receiving from the network I am on. If I tracert from my location (France),
the
results are all masked with the destination address (Google's public DNS). I
understand that something in the network is substituting
There's a 10g-only mode for the supervisor ports on the Sup720-10GE.
mls qos 10g-only
This mode disables the 1Gb/s ports, and enables 8q4t ingress and 1p7q4t egress
queueing on the 10Gb/s ports, which is the same as the ports on the 6708 card.
If queueing is the only failed consistency
I had a problem with BFD while doing some Nexus 7000 testing recently, and
wonder if what I'm trying to do isn't expected to work:
- 3 OSPF routers (all Nexus 7000) sharing a common broadcast domain with a /29
subnet mask.
- The OSPF interfaces are SVIs.
- The VLAN is forwarding only on a
There is no part of this path with parallel, load-balanced connections, which
could be a
obvious cause. What else could I check? The packets do arrive, so they are
not being
dropped on the way, but they arrive out of sequence, being useless to the
application.
I've seen UDP packets (also
Drew said:
With a 6513-E would you be able run it with:
2xSUP720-3BXLs
10xWS-6748(/w DFCs)
1x WS-6708?
I don't think so. The fabric limitation with Sup720 in a 13-slot chassis isn't
so much a chassis problem as it is a supervisor fabric problem.
The Sup720 just doesn't have enough fabric
Erik Nelson said:
No, the console cable on a 3110G ends in a serial DB9 female connector.
Indeed:
http://www.cisco.com/en/US/docs/switches/blades/3110/hardware/installation/guide/HIGCABLE.html#wp1051039
The console port uses a USB connector. The supplied USB-to-DB-9 adapter cable
is used to
I have a friend who has been gifted with two new Cisco 881s and strict
orders to get multicast flowing between two locations using a GRE tunnel.
We're happy with our IP routing, tunnel protection won't be a problem, but
it's been forever since I touched multicast and these things show no
I'm trying to loadbalance between two tftp-servers in an ace4700.
I only have one service Vlan connected to the context.
I'm having problems with the nat on the udp in the response.
I can't get the src-nat to work on the response from the servers.
Most TFTP servers send their reply traffic
mode desirable in your interface configurations is almost certainly wrong.
That mode enables the Cisco-proprietary PaGP link aggregation mechanism, which
IBM probably doesn't support.
mode active enables standards-compliant LACP.
mode on forces aggregation without any negotiation.
You'll need
sw2950 running c2950-i6q4l2-mz.121-22.EA13
Is normal the cpu behaviour? I attached an image, I hope it wont be
removed
switch is just managing multicast traffic
http://postimage.org/image/2hp8nccw4/
You should try show proc cpu during peak periods to see what processes
are active.
but when connected to a FreeBSD laptop it does send break so it must be a
driver limitation
It's a while since I've looked to be honest, so it's probably my shonky
memory there. Certainly, I've not found a way using the PL2303 and
driver that I am (which is a kext file downloaded of them
Solaris 8 used ICMP mask requests as a part of the jumpstart process. Newer
versions might also.
But they didn't send requests to a router, they sent directed requests to the
jumpstart server IIRC.
/chris
-Original Message-
From: cisco-nsp-boun...@puck.nether.net [mailto:cisco-nsp-
Greetings,
Let's say that I've got some Catalysts that were ordered without a k9 (crypto)
software image. These switches are under SmartNet support, and are installed
in a crypto-okay country. I'm happy with the current feature set and version,
except that I want to enable SSH.
If the
I was wondering if anyone had a good suggestion for extremely cheap
terminal servers (Avocent, Xyplex, Cisco, etc).
I've purchased Xyplex MX-1620 terminal servers on ebay for $1 per port,
including shipping.
Cisco pinout (use rollover)
TCP port is 2000+(100*port-number)
Requires a TFTP
On Thu, Dec 30, 2010 at 10:02 PM, Jay Nakamura zeusda...@gmail.com
wrote:
Do anyone have recommendation on console server?
I've been mostly happy with Lantronix SLC gear.
They've had a recent supplier issue, which forced PCMCIA slots to turn into
USB, and upset the applecarts of people who
On Sun, Oct 31, 2010 at 6:18 PM, christopher.mar...@usc-bt.com wrote:
speed 1000 on a copper port capable of 10/100/1000 disables 10 and 100
Mb/s operation by removing those modes from the list of those advertised
to the link partner.
This may be useful if you would prefer a cable
speed 1000 on a copper port capable of 10/100/1000 disables 10 and 100 Mb/s
operation by removing those modes from the list of those advertised to the link
partner.
This may be useful if you would prefer a cable failure on pins 4, 5, 7 or 8 to
drop the link and keep it down, rather than
I reckon separating the network into
different OSPF areas without summarization at ABR cannot minimize OSPF
database, all routers still receive routes advertises by other routers.
Not true. All /prefixes/ will still be visible in all areas without
summarization, but you'll still minimize the
The I/G bit must be cleared in the source address of an Ethernet frame.
Ref: IEEE 802.3-2002, Section 3.2.3(b)
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archive at
jneiber...@gmail.com wrote:
On Fri, Oct 15, 2010 at 2:47 PM, Lee ler...@gmail.com wrote:
On 10/15/10, John Neiberger jneiber...@gmail.com wrote:
We have an application involving a firewall cluster where the cluster
has a VIP associated with it, but the VIP apparently replies to ARP
Peter said:
On Wed, 2010-10-13 at 06:08 -0700, David Barak wrote:
There is a document on cisco#39;s site regarding how IGMP snooping
breaks multicast in typical LAN environments. I don#39;t have the
link handy, but it should be googleable. Effectively, the issue is
that the switches do
Why ospf takes so long to load when labbing on dynamips? Particulary in lan
segments it almost takes forever ,if anyone has any method to improve the
convergence time, I would love to hear it!
The performance bottlenecks in my dynamips environment have been:
1) idlepc (already mentioned)
2)
I got a huge performance boost when I moved the dynamips directory to
a reasonably fast disk subsystem.
uh, why was this? Surely you weren't paging your inbound packets to disk
before forwarding them? Or was this purely for startup / shutdown?
I never investigated it very far, but I
Nikhil said:
Take a look:
NX-OS Book:
http://www.ciscopress.com/bookstore/product.asp?isbn=1587058928
do you mention this book because it has Nexus in the title, or because you
read it and found it valuable?
/chris
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Gert Doering said:
On Tue, Oct 12, 2010 at 07:45:10PM +0200, Peter Rathlev wrote:
I'm just guessing here,
but I don't see why routed multicast traffic would need to have the L2
group bit set.
Well, if you only ever have two routers in a subnet, it doesn't need to...
But what if you
If a host has two
NICs connected to two switches,(the two switches are connected
together) and load balancing between them, switch will see the same
source MAC from two ports. How does a switch decide which ports to
put in the forwarding table? Would it switch back and forth every
*Maximum* transmit power is 4 dBm and max receive is -1 dBm, so an
attenuator is certainly highly recommended for short distances.
Minimum cabling distance for -LR, -SR, -LX4, -ER modules is 2m,
according to the IEEE 802.3ae standard
And?
The linked document (which you trimmed)
Nick:
The patch cable length really doesn't matter. What matters is the
attenuation and ensuring that your received light level at each end is within
the threshold of what's acceptable to the transceiver receiver port.
So, where does that leave the OP's LR links? Does it boil down to get
He should actually be ok even with ER and no attenuators as minimum
transmit power is -4.7 dBm and max receive power is -1 dBm (per cisco
site). Just check optical power levels and see if they are in limits.
Uhm, no.
*Maximum* transmit power is 4 dBm and max receive is -1 dBm, so an
Please elaborate.
How do you manually configure which end of the link is master for clocking
purposes?
Sorry for top-posting. Sent from my clunky phone interface.
/chris
Nick Hilliard n...@foobar.org wrote:
On 20 Aug 2010, at 17:57, christopher.mar...@usc-bt.com wrote:
Regardless of what
Andrew said:
On 20/08/2010, at 5:57 PM, christopher.mar...@usc-bt.com wrote:
Two mentions of problems with manually configured gigabit operation.
Is there really a problem in that scenario? Shouldn't be.
Regardless of what the UI appears to be doing, you can't do gigabit without
My favorite is when the sys-admin sets 10-12 prod servers to 100/1000 -
full
doesn't tell anyone and then comes back in a panic because the
network
blew up.
I have had so many problems because someone forced 100/Full,
1000/Full on a
switch and the servers
could
A) Not set duplex
I'm trying to implement PBR-filtering of MSDP messages from a Nexus 7000
running 5.0(2a), and I'm starting to think that the route-map is being
interpreted wrong.
The relevant parts of the configuration are:
feature msdp
feature pbr
ip msdp originator-id loopback0
ip msdp peer W.X.Y.Z
Huh. The copy of this note in my outbox is formatted nicely, but the one
forwarded back to me by the list is a mess.
I'm not sure what happened to the newlines. Thank you, Outlook. Trying again,
sorry for the noise.
I'm trying to implement PBR-filtering of MSDP messages from a Nexus 7000
while there are clueful folks on this list that know N7K and NX-OS, i
don't think cisco-nsp is an appropriate replacement for talking to the
TAC.
Perhaps not. I appreciate your reply, and hope my query isn't widely
considered as inappropriate.
but regardless, i _think_ what you're likely
I've seen the same as well.
In my case, I noticed 'ip host' commands and a default route in the management
vrf that I hadn't created. Both referenced 10.x addresses.
I didn't notice any nasty traffic on the management network.
After seeing Chuck Church's note, I pulled a fresh 5020 from its
Said Jeff Wojciechowski:
FastEthernet0/3 is up, line protocol is up (connected)
snip
Full-duplex, 100Mb/s, media type is 10/100BaseTX
snip
5 minute input rate 2000 bits/sec, 3 packets/sec
5 minute output rate 3000 bits/sec, 4 packets/sec
0 runts, 0 giants, 0 throttles
It's
Multiple inline devices gets sketchy very quickly.
During device failure, some boxes turn into crossover cables, others into
straight cables.
If you've got a 100Mb/s device that doesn't do MDI/MDI-X, how do you cable it
up correctly so that link can be established regardless of which devices
T.V. said:
If you have an OOB network that requires the 5k mgmt0 ports to be used
there, burn one of 1-8 on a 5010 or one of 1-16 on a 5020 as a gig port
and
do another VRF specially for the peer link. Done.
You could certainly send the keepalive traffic on that OOB network, but many
OOB
- is compatible Mac OS X,
*- knows how to send breaks (the must have feature),*
On OSX there's a great terminal emulator called ZTerm, written by Dave Alverson.
It supports a nifty feature to send BREAK even when your hardware or drivers
don't support it.
BREAK amounts to holding the TX
Said Vince:
On the C3560, with default config, i believe igmp snooping is enabled
by default. A multicast source floods all traffic to all ports in the
vlan, until I configure 'ip igmp snooping querier' at which point the
flooding stops. I would have expected igmp snooping to figure out that
It sounds like you intend for the 10.1.1.0/24 subnet to be UNtagged?
interface Vlan309
description Linux Host
ip address 10.1.1.1 255.255.255.0
!
interface Port-channel32
desc LACP bonded 3 GigE interfaces
switchport
switchport access vlan 309
With a tagging (trunk) interface,
Nick Hilliard:
Just avoid using tags 1002-1005, as Cisco
has
made claims to these particular vlans.
According to Cisco Press, the problem is bigger than just VLANs 1002-1005:
Numbers 1001 to 1024 are reserved by Cisco and cannot be configured.
We are currently using 2960Gs with IGMP
querier enabled
I'm thinking a
4948 or 3750G would work.
It sounds like you're using the L2 'ip igmp snooping querier' function in your
2960.
I don't think that feature is available in the 4948.
IGMP snooping as a function of enabling multicast
Phil Mayers:
Nope. All 3Com devices from superstack II onwards have per-VLAN FDBs,
and all the Extreme's I've ever seen do too.
Tempting though it is to rag on the cheaper switches, they do usually
manage the basics ;o)
3com's CoreBuilder 3500 was not endowed with this basic feature when it
These days you can get cheap twinax 10G cables with SFP+ at the ends
to
connect two Cisco switches or two Procurves. Short distance only of
course, but very cheap.
They're also useful for connecting servers to top-of-rack 10G switches.
But curiously, they're currently unsupported by Cisco
These days you can get cheap twinax 10G cables with SFP
they are currently unsupported on N7K for good reasons that are
technical. strongly suggest that you don't use it for a production
environment.
They seem to work fine in this application, however.
suggest you do shut on one side
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