About alistair777

alistair777 · 03-17-2016

Hello, I am having trouble understanding the direction in which the load-balancing algorithm is applied in a switching scenario. Consider two switches S1 and S2 connect together via a port-channel. S1 is on the left and S2 is on the right. On S1 if...

alistair777 · 03-17-2016

Hello, I have been unable to find a succinct answer to this question so I thought I would ask on the official Cisco support forums. If two switches are trunked together with 802.1Q and the native VLAN is tagged on one side with "(config)#vlan dot1q...

alistair777 · 11-19-2015

Hi, I have an access layer switch with two trunks facing two seperate routers which are connected together via a L3 link and L2 trunk (this is a mixed End-to-End VLAN and Local VLAN scenario). I would like to use HSRP to have a virtual gateway for t...

alistair777 · 11-01-2015

Hi, I would like to know from those who have deployed AS-Path prepending configuration in a BGP multihoming scenario. Does this involve any significant disruption in connectivity or is it seamless like adjusting local preference and then resetting ...

alistair777 · 11-01-2015

Hi, If I am multihoming with two providers with two seperate routers and running iBGP between them - will both my routers have to store two seperate copies of the routing table thus consuming twice the TCAM space? So roughly over 1 million routes?

alistair777 · 11-19-2015

Hi Jon, I think my issue may arise with my understanding of STP - I posted a question a while ago concerning Local VLANs and created a lab in packet tracer. I could see that the uplinks were not blocked due to the V topology created. (No loop as the ...

alistair777 · 11-19-2015

Thanks for confirmation so are you saying it would be wise to switch to GLBP to get round the L2 loop issue (ie, ARP request broadcast looping) for Local VLANs in HSRP?

alistair777 · 11-19-2015

Hi Jon, Thanks for that I too updated mine yes I can see how that could be an issue if the Active HSRP interface was live but the uplink itself on the switched failed. That aside however would there be away to bring up both HSRP Active/Standby pair...

alistair777 · 11-19-2015

Hi Jon, Thanks for the response I thought so although I have observed the following: The standby interface stays in Init mode, only when it is allowed on the trunk does the interface then switch to Standby. I have then tested failover and this works...

alistair777 · 11-19-2015

Hi Masoud, Yes PVST is configured and root brige on R1 is lowest with R2 as the secondary root bridge. A trunk has been configured between the routers to allow end-to-end VLAN communication. There is a L3 etherchannel (interface vlan 90) to pass t...

Member Since	‎09-09-2014 04:11 PM
Date Last Visited	‎11-12-2017 12:10 PM
Posts	29

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Port channel load balance algorithm

Tagging native VLAN both sides

Local VLANs & HSRP

AS-Path Prepending & Connectivity

Internet Routing Table Storage

Hi Jon,

Thanks for confirmation so

Hi Jon,

Hi Jon,

Hi Masoud,