[ s4810-01 ] interface Vlan 777 description [Dell_vrrp] ip address 192.168.102.1/24 ip address 10.11.6.1/24 secondary untagged gigabitethernet 2/24-35 tagged gigabitethernet 2/42-47 ! vrrp-group 30 priority 150 virtual-address 192.168.102.3 ! vrrp-group 31 priority 150 virtual-address 10.11.6.3 no shutdown ! [ s4810-02] interface Vlan 777 description [Dell_vrrp] ip address 192.168.102.2/24 ip address 10.11.6.2/24 secondary untagged gigabitethernet 2/24-35 tagged gigabitethernet 2/42-47 ! vrrp-group 30 priority 100 virtual-address 198.168.102.3 ! vrrp-group 31 priority 100 virtual-address 10.11.6.3 no shutdown !
Friday, August 29, 2014
Force10 VRRP
Sunday, August 24, 2014
VLT Domain Failure Scenarios
I did some investigation tonight in my Lab running OS
9.5.0.1 with VLT and taking down the VLTI and Heartbeat Links. Here is
what I found out in case your customers ask you "What happens when…?"
Scenario 1: All link up
Results : All links from the end-devices to the 2 VLT
switches are up.
Scenario 2: VLTI link between switches goes down but
Heartbeat Link is up
Results: The End-devices link(s) to the Secondary
switch will go down to prevent a Loop but continue to pass traffic through the
Primary switch. If there are any Non-VLT configured interfaces they will
not be effected by the VLTI link going down and continue to pass traffic
normally. The Heartbeat connection is still passing the hello packet.
Scenario 3: VLTI Link up but Heartbeat link goes down
Results: Everything continues to pass traffic
normally without taking any interfaces down. The reason is that the only
thing that the Heartbeat link does is pass a 56 Byte hello Packet stating
"I'm here".
Scenario 4: VLTI and Heartbeat Link go down but the
switches are still up
Results: Each switch within the VLT Domain will
become the Primary with the End-devices connection still up passing traffic as
normal. This is call a Split Brain scenario where there is a loop within
the Network as the End-Devices are passing traffic down each interface to the
switches within the VLT Domain. This is a reason to have RSTP or PVST+
(future Klamath release) configured in conjunction to VLT so in case a Split
Brain Scenario happens we can have some type of backup to help prevent loops
within the Network.
So the bottom line is that we want the Customers to use the
OOB interface to support the Heartbeat due to the fact that if they used the
VLTI and Heartbeat as the same interconnection and it went down they would
cause a Split Brain scenario and cause more issues within their Network.
JOHN BECK, Enterprise
Technologist | Networking
Dell | Office of Technology
& Architecture | CTO
Office #: (847) 515-5910
Cell / SMS #: (847) 207-6348
Fax Number #: (847) 515-5921
E-mail: j_beck@Dell.com
Friday, August 1, 2014
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