Hi all, I recently did a switching course, We had a setup where we had say 1 distribution switch root for vlan 2, this would be secondary root for vlan 3, and a dist switch root for vlan 3 and secondary root for vlan 2. My question is If these switches are the gateways for the pc's ie running vlan routing, would you need to set hsrp on them as I see you would have to due to the spanning tree design ?
HSRP and Spanning-Tree are two very different things.
Sppanning Tree within a broadcast domain prevents having multiple parallel paths that cause Broadcast Storms.
HSRP (or VRRP) is a protocol that provides multiple physical "gateways" to be represented as a single logical "gateway" (where one physical gateway is redundant to another ... not both active at the same time in the same broadcast domain).
With HSRP/VRRP when the designated primary gateway goes down, the traffic uses the secondary.
Where things *can* get complex is when you have multiple gateways, multiple vlans.
Given that you have two gateway routers, (X and Y), and two VLANS (A and B).
It is common to do some load balancing in this scenario by making Router X the primary and Router Y as the secondary for VLAN A, while Router Y is the primary and Router X is the secondary for VLAN B.
If the outbound path from Router X fails, all traffic uses Router Y, if the outbound path from Y fails, all traffic uses Router X.
If both paths are up and functional, then the traffic is split between the two gateways (according to how you have the hosts "Default Gateway" set).
Spanning-Tree is strictly for loop prevention, there is only one root bridge.
Hi Carl, further to ur discussion with all. you can implement HSRP with Spanning Tree Mode like PVSt+/MST & can load balance across ur main siwtches. Like If u hv two Core/distribution switches & multiple vlans on these switches then u can configure odd vlans as active on one core & even vlans active on another core with the help of HSRP, here I m talking abt load balancing with HSRP. Now with MST/PVST+ u can define CORE-1 as a root bridge for vlan 1 where odd vlans r active & can define CORE-2 as a root bridge for vlan 2 where even vlans r active. So It wud provide u proper load balancing as well as protection from Loop.
I hope you understand. If not please do not hesitate to ask again.
Question We run asr9001 with XR 6.1.3, and we have a very long delay to
login w/ SSH 1 or 2 to the device compare to IOS device. After
investigation, the there is 1s delay between the client KEXDH_INIT and
the server (XR) KEXDH_REPLY. After debug ssh serv...
Introduction The purpose of this document is to demonstrate the Open
Shortest Path First (OSPF) behavior when the V-bit (Virtual-link bit) is
present in a non-backbone area. The V-bit is signaled in Type-1 LSA only
if the router is the endpoint of one or ...
Hi, I am seeing quite a few issues with patch install and wanted to
share my experience and workaround to this. Login to admin via CLI, then
access root with the “shell” command Issue “df –h” and you’ll probably
see the following directory full or nearly ...