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1500 questions
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3 answers

Trying to test a virtual lab VRRP configuration for STP issues

I'm in the middle of setting up a lab with a VRRP configuration, and I'm trying to search for any possible issues we might run into in production. One issue I am aware of with VRRP is that it seems that STP convergence time (of about 45 seconds I…
Geekman
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2 answers

Can one configure several static EIGRP Neighbors on one interface?

Can one configure several static EIGRP Neighbors on one interface and are there any considerations apart from disabling split-horizon that one should consider?
Max
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9
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2 answers

How do you throttle Dropbox Traffic?

It appears that Dropbox uses Amazon AWS for it's storage, so I am not able to just block or trottle traffic to dropbox.com Since there are a lot of web services that rely on AmazonAWS, I cannot just block that domain. Do you have any suggestions…
Blake
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9
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3 answers

ipv6 addressing /127 vs eui-64

Best practice is to use a manual /127 address for point to point addressing described here RFC2373 for EUI-64 ERFC 2373 dictates the conversion process, which has two steps. The first is to convert the 48-bit MAC address to a 64-bit value. To do…
DrBru
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9
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1 answer

Globally disable QoS on Cisco 3750 in production

I suspect some issues with faulty QoS settings on a 3750 stack running in a 24x7 environment. The 3750 mainly routes between vlans on a lan segment. Since it is a lan device (not terminating any wan links) i want to globally disable QoS (no mls…
user209
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9
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6 answers

Pinging broadcast address

I am using Linux. I read somewhere on the internet that pinging the address 255.255.255.255 will ping everyone in the network segment. And it will return every IP addresses in that subnet. But when I tried ashokkrishna@ashokkrishna-Lenovo-B560:~$…
ashok
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9
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4 answers

Delay or Offset-List for EIGRP tuning?

Studying for CCNP-ROUTE - everything I read says it's preferable to use delay and offset-lists for metric tuning vs. say bandwidth in EIGRP. In practice what is more commonly used out of those two options (delay/Offset-lists)? How common is low…
A L
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4 answers

ASA FTP Special Character in password issue

I am trying to copy a show tech from an ASA to a remote server via FTP. My issue is that the password I am providing has a '@' and it is being interpreted incorrectly by the CLI. I have tried putting a '\@' but the command still fails. Anyone…
Blake
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9
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3 answers

ASR1K feature licensing navigation

I'm looking at deploying a pair of ASR1001 units at the WAN edge to support 2x IP Transit and 1x Peering services. I need to do IPV4 and IPV6 eBGP and iBGP to advertise the peering routes into the core as the peering service will only be on one of…
Eric
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2 answers

Does port mirroring cause additional latency?

If I'm sending traffic from host A to B by a switch, will enabling a mirror/SPAN port increase the time it takes for my frames to get from A to B? Nb: I'm not worried about the time it takes for the mirrored frame to reach my monitoring host. Just…
Juicy
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9
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1 answer

Dell powerconnect 6248 voice vlan next to dot1x

We are testing currently dot1x auth against FreeRADIUS/AD in the network. The vlans are dynamically assigned by FreeRADIUS on AD-group base. This works, but now the problem comes: We wanted to add our ip-telephones which doesn't speak dot1x to the…
timmeyh
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9
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1 answer

Prefixes with aggregate labels not fully tracerouting across MPLS core

I have two routers, A (Cat6500 w/SUP720-3BXL, IOS 12.2(33)SXH4) and B (Nexus 7K w/SUP1, NX-OS 5.2(4)), separated by several hops across an MPLS core, each with VRF ABC. Router A has two directly connected routes and four static routes within this…
Jeremy Stretch
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9
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3 answers

Why many of our WANs use fixed bandwith division between up- and downstream?

To multiplex upstream and downstream traffic typically frequency multiplexing or time multiplexing is used. E.g. an ADSL connection may use FDM and use 25kHz to 138kHz for upstream and 138kHz to 1104kHz for downstream connections. In this case the…
yankee
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9
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2 answers

LACP rate slow vs fast... impact on bandwidth?

Is there any impact on bandwidth when choosing fast (1s) LACPDU timing rather than slow (30s)? Anyone ever bothered to measure? I've always assumed it's negligable, with the simple act of bonding probably adding more overhead than any LACPDUs
batfastad
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9
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4 answers

Changing the DHCP server

We have a LAN with 20 machines on it. They are connected to a switch which also connects to our primary Westell DSL modem for internet access. The modem does the NATing and is the DHCP server, (so that our internal addresses are 192.168.1.*). We…
J. L. Tympanum
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