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1500 questions
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votes
1 answer

How long is a frame really supposed to be, and when is a frame a babble?

I'm studying some networking things, and something I noticed in the interface counters on a Cisco switch (output of #sh int) one counter for 'babbles' 0 babbles, 0 late collision, 0 deferred Cisco defines babbles as 'Babble errors occur due to the…
awr
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7
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2 answers

Won't GLBP confuse a switch's mac address-table?

Say for example two routers (R1 and R2) are connected to the same switch (SW1) and both routers have Gateway Load Balancing Protocol (GLBP) correctly configured as the First-Hop Redundancy Protocol (FHRP) solution. Router 1 has been elected the…
Joseph Shih
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6
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1 answer

Cisco 867 forward UDP port range

I need to forward an UDP port range to a specific private IP address in my LAN. In order to forward one port to an internal IP I do: access-list permit any any eq ip nat inside source static …
eldblz
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6
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2 answers

Connect one router to layer 3 3750-X stack for redundancy

I'm connecting a Cisco 2851 router to a Layer 3 3750-X stack (2 switches). The Gi0/0 interface connects to an access port on the stack master. How can I achieve redundancy from the 2851 to the stack member? Throw another HWIC into the router and…
user6069
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6
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1 answer

Rolling Stack Upgrade on a Catalyst 3850

I'm looking to do an IOS upgrade on a two Switch 3850 stack, with minimum downtime. As our servers all have redundant uplinks to each switch, it would be preferable to reload each stack member individually. Unfortunately all the documentation I've…
bbezaire
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6
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1 answer

SNMP OID for advertised routes by peer

I've found the following SNMP OIDs: BGP Peers: .1.3.6.1.2.1.15.3.1.1 BGP Peer state: .1.3.6.1.2.1.15.3.1.1 But I'm looking for the list of advertised routes by peer. Does anybody know of a way to get this via SNMP? My fallback is to use SSH and…
bahamat
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6
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1 answer

On the Cisco AIR models, what is the definition of radio reset code 71?

We are using the Autonomous mode... Cisco IOS Software, C1040 Software (C1140-K9W7-M), Version 15.2(4)JA1, RELEASE SOFTWARE (fc2) ap#sh controllers do1 radio-reset Last radio reset code: 71 Radio resets - total:22 retries:0 failed:0 Reset Stats:…
EFMARTIN
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6
votes
2 answers

USE of ICMP echo request in DHCP

In RFC2131 (page 12) it's been mentioned that The server should use whatever information is available in the configuration information repository to choose an address to reuse. For example, the server may choose the least recently assigned …
dillip_beta
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6
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2 answers

How to synchronize MD5 digest between VTP Server and Client?

Follow up to this Q&A. According to one of the answers it should be possible to solve a MD5 digest mismatch by synchronizing username, password and domain between VTP Client and Server and subsequently executing a VLAN change on the VTP Server to…
030
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6
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3 answers

When is a layer 3 switch more appropriate than a router in a branch office?

It seems that as time passes, vendors have added almost all the features of a router to a layer 3 switch. For branch office deployments, how do other people who design networks choose between deploying a router + a layer 2 switch vs deploying just…
Sam A
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6
votes
3 answers

Block usage of proxy server

I am network administrator in a small company. Until recently i used the Cisco ASA to prevent the employees from surfing facebook, youtube... But now they are using proxy server to overcome this. Any idea on how to prevent this ?
darko
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6
votes
2 answers

How do I mcast multiple pcap files simultaneously with guaranteed ordering and controllable speed?

We capture many pcap files every day on many different multicast groups. For the purposes of testing & benchmarking, we wish to replay these files in an isolated environment and in a controlled way. These pcap files are captured simultaneously,…
John Dibling
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6
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2 answers

How to "size" a Router for a Given Uplink

I'm the tech guy for a small business. (15 office computers, ~15 staff BOYD's, ~30 guest devices.) I'm looking to replace our Asus RT-N53 with a business class router and two access points each servicing a private and a guess SSID on separate VLANs.…
Kyle Johnston
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6
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3 answers

Cisco VPN Logs Do Not Show The Username

I have a Cisco VPN (not sure exactly which hardware) whose logs are forwarded to our Splunk server. It appears the username is redacted. All I see are asterisks. Is this something that can be changed on the VPN and how? Hopefully there is enough…
iAwardYouNoPoints
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6
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1 answer

Why does BGP goes to Active states once we enable new routes?

To give you an idea of what is happening, I've two eBGP peers with no routes advertised. The capabilities are zero and there is no NLRI. The BGP is established between the eBGP peers. Next, I ask one of the peers to advertise IPv4 routes by…
BHV
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