About Alexander Istomin

Alexander Istomin · 06-10-2020

Hello, experts. We plan to upgrade ROMMON and IOS XE on Catalyst 4503E that is working in VSS mode.ROMMON: from 15.1(1r)SG5 to 15.1(1r)SG18IOS XE: from 3.8.4.E to 3.11.2E I've read this guides:1. ROMMON: https://www.cisco.com/c/en/us/td/docs/switches...

Alexander Istomin · 10-10-2019

Hello everyone! What is the best practice to configure STP in the scenario as shown in the picture below?How to protect ISP network from misconfiguration on the client side? 1. Root on ISP side?2. Root guard on access ports to client?3. Something els...

Alexander Istomin · 02-05-2019

Hello everyone! I'm trying to configure AAA authentication on my ASR9K box with remote freeradius server and the problem is that ios xr prepands extra symbols to User-Password attribute: User-Password = "qwerty\000\001P\036`\264O\223\265|" as resul...

Alexander Istomin · 12-11-2017

Hello, I have a strange problem with MSDP perring on my 3560 box, in logs i see: 059846: Dec 11 14:27:10.156 MSK/MSD: %MSDP-5-PEER_UPDOWN: Session to peer 192.168.1.1 going down059847: Dec 11 14:27:23.091 MSK/MSD: %MSDP-5-PEER_UPDOWN: Session to pe...

Alexander Istomin · 10-09-2017

Hello everyone! I work for an ISP and on access layer we use ring topology. We use rstp for l2 redundancy on access layer and REP(resilient ethernet protocol) on core/aggregation layers. To tunnel BPDU between edge switches in the access ring we us...

Alexander Istomin · 06-12-2020

Leo, I did upgrade (ROMMON + IOS) exactly as you wrote and everything went fine.All update (ROMMON + IOS) lasted about 10 minutes. The minor thing what i want to add to your plan is don't forget to check bootvar with:show bootvar before doing:redunda...

Alexander Istomin · 01-13-2020

Hello!The bug was opened on this case:https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvi31649I did't have time to try workaround because changed my job.

Alexander Istomin · 11-15-2019

Hello! What type of authentication/authorization do you use? Local/TACACS/RADIUS?

Alexander Istomin · 10-17-2019

Again, in order for the 2 routers to exchange routes, they must be neighbors and there must be an adjacency between them. Neighborship and adjacency are different states. 2-way state is enough for 2 routers to become neighbors, but not enough for the...

Alexander Istomin · 10-17-2019

Hello. As you know, OSPF is link state protocol. Every link state protocol based on the rule, that all routers in the same area should have same view of the network topology. Every link state protocol based on graph theory and specially on Dijkstra's...

Member Since	‎01-16-2016 02:09 AM
Date Last Visited	‎01-05-2021 06:24 AM
Posts	23
Total Helpful Votes Received	15

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Updating IOS XE and ROMMON on Catalyst 4503E in VSS mode.

Common STP domain between ISP and customer

IOS XR and Freeradius

MSDP perring flaps

Long RSTP convergence time

Re: Updating IOS XE and ROMMON on Catalyst 4503E in VSS mode.

Re: IOS XR and Freeradius

Re: Unable to acces a switch

Re: OSPF Questions

Re: OSPF Questions