About dgahm

dgahm · 08-20-2008

Does IGMP snooping work with Q in Q 802.1ad(dot1q tunneling)? I have searched extensively but can't find a clear answer.I am on the customer side, and my testing suggests that either snooping is working on the carrier side or flooding is restricted t...

dgahm · 03-20-2008

We have an auditor that wants to see all active signatures from our version 6.0(3) SSM-10s.Is there any way to export all active signatures in report form? The auditor says he has received this from other clients.We use CSM, ASDM, and MARS but I don'...

dgahm · 01-13-2008

I am trying to understand some interesting layer 2 behavior that occurred when pruning a VLAN.The topology is a 3750 stack uplinked to a 6509 and 4006 via 1gb fiber ports configured for dot1Q trunking. The 6509 and 4006 are also connected by a trunk....

dgahm · 01-11-2008

Is it possible to use SSL keepalives with a uri string? The config guide seems to say just SSL Hellos, but I would like confirmation.Today we have this:<b>service WWW-Test keepalive type http keepalive uri "http://XXX.XXX.197.28/efs/servlet/efs/w...

dgahm · 09-28-2007

What determines the length of time that syslog is retained by Ciscoworks? We have a requirement to keep logs for 1 year, but only seem to have 2 months. The server has over 60 GB of free space, so there must be a config setting somewhere?Thanks

dgahm · 09-02-2008

Giuseppe,Thanks for the very useful information. I was not aware of the PIM snooping feature, but as you note it does not appear to work with QnQ. We are already configured for point to point routing VLANs so simply removing the tunneling will elimin...

dgahm · 06-10-2008

Are you going to have both data centers active at the same time? Do you have public address space available to assign a different /23 to the new data center? If yes to both, you will need an IBGP link between the sites and Global Site Selectors (GSS-...

dgahm · 05-21-2008

That sounds like a bridge loop. Is Spanning Tree enabled on the switches for the VLANs involved?

dgahm · 05-21-2008

VTP allows you to define VLANs on a server switch and have the client switches learn about the new VLAN dynamically. VTP does not assign ports to VLANs. You still need to go to the individual switch to do that.Please rate helpful posts.

dgahm · 03-25-2008

Darren,Yes, normally the router, if using a DTE cable, needs to obtain clocking from the DCE. Sometimes a tail circuit needs to clock a DCE which is where the external clock comes in (TXCE+ TXCE-). If the router drives those clock signals (not sure, ...

Member Since	‎12-12-2000 06:16 PM
Date Last Visited	‎08-18-2017 03:50 AM
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Q in Q multicast

IPS Signature Export for Audit

Manual VLAN Pruning Issue

CSS SSL Keepalives

LMS 2.6 Syslog Storage Duration

Re: Q in Q multicast

Re: Redundant geographically separate Internet connections.

Re: LAN Protection Strategy

Re: Question about VTP, VLAN and remote switchport assignation

Re: Hard Loopback testing