02-25-2019 01:06 AM
Hi,
We have a pair of 4500X-16's running in VSS mode, we have an issue that when the primary fails we lose all external routing.
They are running a comparatively old IOS version - 3.6.3E (ROM 15.0(1r) SG12)and I know that has some bugs in in it so maybe a contributing factor ?
We have 2 interfaces from our ISP 1 in the primary and 1 in the secondary , these are trunked vlan ports.
interface TenGigabitEthernet1/1/16
description *** Primary link ***
switchport trunk native vlan 66
switchport mode trunk
----------------------------------
interface TenGigabitEthernet2/1/16
description *** Secondary link ***
switchport trunk native vlan 66
switchport mode trunk
-------------------------------
vlan 66
name VM_Vlan
-------------------------------
interface Vlan66
description Router_Vlan
ip address 172.31.1.217 255.255.255.248
---------------------------------
ip route 0.0.0.0 0.0.0.0 172.31.1.218
--------------------------------
I am only guessing but believe the issue not to be with the 4500 but the ISP ?
02-25-2019 01:46 AM
02-25-2019 08:39 AM
As suggested upgrade the IOS, also like to see your network topology, how you connected these switches to ISP network ?
02-25-2019 11:28 AM
Hi,
For Sub-Second convergence with VSS, you need a routing protocol neighbor ship and NSF/Graceful restart enabled.. From the configs shared, i only notice a Static route configured and with static routing you cant achieve a sub-second convergence..
Regards
Mahesh N
02-25-2019 06:46 PM
Hi,
This is not an IOS, hardware or software issue. This is most likely a design issue. If you have 2 different ISP, how is that that your static route is pointing to one IP only? What is design look like? Most ISPs don't do layer-2 with their customers, I am curious how you are connected to the providers. Are these ISPs providing your Internet access?
HTH
02-26-2019 12:44 AM
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