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- About Vasileios Bouloukos MSc, ITIL, CCIE
11-18-2018
Vasileios Bouloukos MSc, ITIL, CCIE
Participant
Network Engineer with 10+ years of working experience in IP networking and telecommunications, involved in several local and international projects. In depth multi vendor experience in design, implementation, and support of IP network solutions for Service Provider and Enterprise environments.
Expert level (CCIE) technical networking knowledge and certified by several vendors (Cisco, Juniper, Fortinet, VMware, Alcatel-Lucent, Huawei, ITIL). Highly skilled to provide technical consultancy, design (HLD,LLD) and support either locally or remotely.
In depth experience of various Network Monitoring Systems (e.g Nagios, Cacti etc), VMware networking solutions and cloud services (Softlayer, AWS, Azure). In addition, extensive pre sales, technical project management skills as well as deep knowledge in the preparation of RFPs. Finally, granted as Cisco Subject Matter Expert by CISCO for contributing to Cisco Certifications and awarded as Silver Member to the official Cisco Support Community.
Network Engineer with 10+ years of working experience in IP networking and telecommunications, involved in several local and international projects. In depth multi vendor experience in design, implementation, and support of IP network solutions for Service Provider and Enterprise environments.
Expert level (CCIE) technical networking knowledge and certified by
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Member since
10-26-2009
203
Posts
190
Helpful
18
Solutions
07-07-2017
12:56 AM
Hi Marc,
Thank you for your comments.
Soon I will publish an other article about python scripting and functionality in NX-OS. I will keep you update.
Meanwhile, you can have a look at CiscoLive presentations searching with python scripting Nexus. You can find very useful information.
... View more
Created by
Vasileios Bouloukos MSc, ITIL, CCIE
in Data Center Blogs
in Data Center Blogs
07-04-2017
12:21 PM
07-04-2017
12:21 PM
You can get access to the next link:
http://www.firewall.cx/cisco-technical-knowledgebase/cisco-data-center/1206-nexus-nx-os-commands-scripting-hints-and-tips.html
... View more
Labels:
Created by
Vasileios Bouloukos MSc, ITIL, CCIE
in Networking Blogs
in Networking Blogs
07-04-2017
12:18 PM
07-04-2017
12:18 PM
You can get access to the next link:
http://www.firewall.cx/cisco-technical-knowledgebase/cisco-data-center/1206-nexus-nx-os-commands-scripting-hints-and-tips.html
... View more
Labels:
Created by
Vasileios Bouloukos MSc, ITIL, CCIE
in Other Network Architecture Subjects
in Other Network Architecture Subjects
07-04-2017
12:10 PM
07-04-2017
12:10 PM
http://www.firewall.cx/cisco-technical-knowledgebase/cisco-data-center/1206-nexus-nx-os-commands-scripting-hints-and-tips.html
... View more
Labels:
Created by
Vasileios Bouloukos MSc, ITIL, CCIE
in Switching
in Switching
05-30-2017
01:26 PM
05-30-2017
01:26 PM
I explain the differences between Nexus and Catalyst switches but also compare commands, naming conventions, hardware capabilities etc. between Nexus NX-OS and Catalyst IOS operating systems. I am looking forward to your comments! http://www.firewall.cx/cisco-technical-knowledgebase/cisco-data-center/1201-introduction-nexus-family-nx-os-ios-differences.html
... View more
Labels:
Created by
Vasileios Bouloukos MSc, ITIL, CCIE
in Other Network Architecture Subjects
in Other Network Architecture Subjects
05-30-2017
01:24 PM
05-30-2017
01:24 PM
Hi Heather, Thank you for your comment. Yes, its nice idea. I am posting it now. Regards, Vasilis
... View more
Created by
Vasileios Bouloukos MSc, ITIL, CCIE
in Other Network Architecture Subjects
in Other Network Architecture Subjects
05-29-2017
03:06 AM
05-29-2017
03:06 AM
Complete Guide to Nexus Checkpoint & Rollback Feature. Fast Recovery from Nexus Misconfiguration. Nexus 9000, 7000, 5000, 3000 http://www.firewall.cx/cisco-technical-knowledgebase/cisco-data-center/1202-cisco-nexus-checkpoint-rollback-feature.html
... View more
Labels:
Created by
Vasileios Bouloukos MSc, ITIL, CCIE
in Other Network Architecture Subjects
in Other Network Architecture Subjects
05-28-2017
02:50 AM
05-28-2017
02:50 AM
I explain the differences between Nexus and Catalyst switches but also compare commands, naming conventions, hardware capabilities etc. between Nexus NX-OS and Catalyst IOS operating systems. I am looking forward to your comments! http://www.firewall.cx/cisco-technical-knowledgebase/cisco-data-center/1201-introduction-nexus-family-nx-os-ios-differences.html
... View more
Labels:
Created by
Vasileios Bouloukos MSc, ITIL, CCIE
in Switching
in Switching
05-20-2017
10:35 PM
05-20-2017
10:35 PM
Take a look to the next article.
It will help you to answer your questions.
http://www.firewall.cx/cisco-technical-knowledgebase/cisco-data-center/1201-introduction-nexus-family-nx-os-ios-differences.html
... View more
Created by
Vasileios Bouloukos MSc, ITIL, CCIE
in Server Networking
in Server Networking
05-20-2017
10:32 PM
05-20-2017
10:32 PM
Have a look to the next article.
It will help you to answer most of your questions.
http://www.firewall.cx/cisco-technical-knowledgebase/cisco-data-center/1201-introduction-nexus-family-nx-os-ios-differences.html
... View more
Created by
Vasileios Bouloukos MSc, ITIL, CCIE
in Routing
in Routing
06-17-2012
12:58 PM
06-17-2012
12:58 PM
Hi all, I was wondering if there is any practical drawback/issue by allocating /31 subnets to the point to point links between the ISP and the customer. This could be very useful and could save public IP addresses. Can you see any limitation that could cause a problem? I do not think that limiting the broacast packets to the p2p link could cause a problem. Have anyone seen or used /31 in PE-CE real scenarios? I was inspired by the next doc http://www.cisco.com/en/US/docs/ios/12_2t/12_2t2/feature/guide/ft31addr.html Thank you Vasilis
... View more
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Created by
Vasileios Bouloukos MSc, ITIL, CCIE
in Switching
in Switching
05-28-2012
02:37 PM
05-28-2012
02:37 PM
Thank you! I have also tested this setup with GNS. It is true, just a few icmp lost packets.... but unfortunatelly I can not really trust the GNS for Layer 2 problems. That is true...we, the engineers, spent a large amount of time for this damn "if" (rollback procedures, standby engineers, alternative configurations, workarounds etc...)
... View more
Created by
Vasileios Bouloukos MSc, ITIL, CCIE
in Switching
in Switching
05-27-2012
11:09 AM
05-27-2012
11:09 AM
I want to avoid the worst case scenarion since the servers are not under my administrition and I could not clear the arp... (otherwise the problem could not exist ) I have to be sure for the next "with a short downtime (shutdown HSRP Interfaces and acitvate/initialize VRRP) the servers should learn the new MAC-Address by the Gratuitous ARP and communication can go on"
... View more
Created by
Vasileios Bouloukos MSc, ITIL, CCIE
in Switching
in Switching
05-27-2012
10:38 AM
05-27-2012
10:38 AM
Thank you! I have to use a new VRRP group since the R1/R2 old routers were CISCO and configured with HSRP. The new routers R3/R4 are not CISCO and do not support HSRP. So I will configure a new VRRP group to R3/R4 with the same VRRP IP as the old HSRP IP.The VRRP will broadcast a gratuitous ARP request containing the virtual router MAC address (according to the RFC that you provided) and the servers will update the arp table. Please correct me if i am wrong. Thanks, Vasilis
... View more
Created by
Vasileios Bouloukos MSc, ITIL, CCIE
in Switching
in Switching
05-27-2012
06:37 AM
05-27-2012
06:37 AM
Hi! I am going to transfer 2 Cisco switches from two routers which are directly connected e.g. R1/R2 to other two routers e.g R3/R4. These switches have connected servers which point to the VRRP IP and are in service. I am trying to have the minimum downtime during the migration of the VRRP IP from R1/R2 to R3/R4. So, the R3,R4 routes use IP from the same subnet pool as R1/R2. The servers will have see the same VRRP IP as default gateway. First task is to shutdown the R1/R2 interfaces. Then, I will configure the same VRRP IP to the new R3/R4 routers. I was wondering that since the new VRRP IP has a new MAC IP when the servers will update their ARP table with the new MAC IP of the VRRP? I mean that since the servers will sent traffic all the time I can not expect to the servers MAC address entry to expire or sent an ARP broadcast (after 4h?). If I ping the servers with source IP the VRRP of the R3/R4 routers will this force the servers to update their ARP table? In this case I also do not have to clear the old MAC entry from the switches? I do not have access to the servers and the solution to shut their interfaces and then to not shut is not feasilbe. Please your advice...rating all the helpful answers and appreciate your help in advance! Vasilis
... View more
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08-12-2017
Everything that you need to know for the Nexus vPC
technology!http://www.firewall.cx/cisco-technical...
08-12-2017
Everything that you need to know for the Nexus vPC
technology!http://www.firewall.cx/cisco-technical...
07-07-2017
Hi Marc, Thank you for your comments. Soon I will publish an other
article about python scripting an...
07-04-2017
You can get access to the next link:
http://www.firewall.cx/cisco-technical-knowledgebase/cisco-data...
07-04-2017
You can get access to the next link:
http://www.firewall.cx/cisco-technical-knowledgebase/cisco-data...
07-04-2017
http://www.firewall.cx/cisco-technical-knowledgebase/cisco-data-center/1206-nexus-nx-os-commands-scr...
07-04-2017
http://www.firewall.cx/cisco-technical-knowledgebase/cisco-data-center/1206-nexus-nx-os-commands-scr...
05-30-2017
I explain the differences between Nexus and Catalyst switches but also
compare commands, naming conv...
05-30-2017
Hi Heather,Thank you for your comment.Yes, its nice idea. I am posting
it now.Regards,Vasilis
05-29-2017
Complete Guide to Nexus Checkpoint & Rollback Feature. Fast Recovery
from Nexus Misconfiguration. Ne...
05-29-2017
Complete Guide to Nexus Checkpoint & Rollback Feature. Fast Recovery
from Nexus Misconfiguration. Ne...
05-28-2017
I explain the differences between Nexus and Catalyst switches but also
compare commands, naming conv...
05-28-2017
I explain the differences between Nexus and Catalyst switches but also
compare commands, naming conv...
05-20-2017
Take a look to the next article. It will help you to answer your
questions.
http://www.firewall.cx/c...
Created by
Vasileios Bouloukos MSc, ITIL, CCIE
in Server Networking
05-20-2017
05-20-2017
Have a look to the next article. It will help you to answer most of your
questions.
http://www.firew...
Public Statistics
| Date Registered | 10-26-2009 12:08 AM |
| Date Last Visited | 11-18-2018 12:20 PM |
| Total Messages Posted | 203 |
| Total Helpful Votes Received | 190 |
Helpful Votes Given To
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| 5 | |
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| 4 |
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Helpful Votes From
| User | Helpful Count |
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| 7 | |
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