CCIE: Blueprint Practice Configs – IP Services

CCIE: Blueprint Practice Configs – IP Services

IP Services ARP: ARP is the process of resolving unknown L2 (MAC) information FROM known L3 (IP) information. Inverse ARP is learning unknown L3 (IP) information from known L2 (DLCI) information.  Proxy ARP, as defined in RFC 1027, was implemented to enable devices that are separated into physical network segments connected by a router in the same IP network or subnetwork to resolve the IP-to-MAC addresses. When devices are not in the same data link layer network but in the…

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CCIE: R&S Lab Attempt and Next Steps

CCIE: R&S Lab Attempt and Next Steps

So, it’s been over a week since my last lab attempt and I have had plenty of time to reflect. I will say that I underestimated the troubleshooting section considerably. My advise is when you hit a difficult question, do not linger on it, move on and try to come back if you have time. It’s hard to assess which tickets are the challenging ones without a little investigation. I will say that if you cannot solve the ticket within 10-15 minutes… MOVE ON. Next…

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Cisco: Jabber Video for TelePresence

Cisco: Jabber Video for TelePresence

Experience telepresence with your family/friends/coworkers. Try our free Jabber Video client today. HD video camera recommended. https://www.ciscojabbervideo.com/home http://www.cisco.com/en/US/prod/collateral/ps7060/ps11303/ps11310/ps11328/data_sheet_c78-628609.html Jabber Video system requirements Windows Windows 7, Vista, or XP (SP 2 or newer), with: • OpenGL 1.2 or newer • For 720p HD calls, Intel Core2Duo @ 1.2 GHz or better • For VGA calls, Intel Atom @ 1.6 GHz or better Webcam (built-in or external; you’ll need an HD webcam for the other side to see you in HD) Broadband…

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CCIE: QoS

CCIE: QoS

Hold-Queue & Hardware TX Ring: TX-Ring DEFAULT on 1841 (128) packets on a FastEthernet interface “tx-ring-limit X” verify with “sh controller fa 0/1 | in tx” FIFO Ingress queue is 75 packets by default and 40 packets on an 1841 FastEthernet interface “hold-queue X in|out” verify with “sh interface fa0/1 | in queue” Keep in mind that the software queue is only invoked when the hardware (TX-RING/FIFO) is full. CPU/packet spikes can tie up CPU cycles causing the router to use…

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CCIE: Multicast

CCIE: Multicast

Preface: To clear old entries in the multicast table, use “clear ip mroute *”. This command usually will allow changes to be sync:ed, but not always. In the worst case scenario, you may have to reload the device. Modifications to a working multicast environment is not recommended if you cannot interrupt traffic forwarding. Be sure to schedule maintenance window in a REAL production environment.  PIM: Signaling protocol that uses the unicast routing table to preform RPF checks. Dense mode: Flood to all multicast enabled interfaces and downstream routers prune…

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CCIE: MPLS

CCIE: MPLS

MPLS: Autoconfig (enable LDP on all interfaces) only available when using OSPF as IGP. LDP send discovery packets via UDP to 224.0.0.2 (all routers) port 646. Route-ID is highest loopback but can be forced “mpls ldp route-id x.x.x.x force”. To use the physical connection of the interface (not the loopback due to lack of reachability) use this command on the interface. ” mpls ldp discovery transport-address interface”. Once communications is established, via TCP 646, authentication is verified (MD5 only). After peer is…

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New Edition to my Neo Collection!

New Edition to my Neo Collection!

Not sure if anyone really cares, but I’m a huge NeoGeo fan/collector.. Today I found quite a surprise at a local gaming store. English version of SvC Chaos (SNK vs. Capcom) for the NeoGeo AES. Needless to say, I did not even hesitate for a second and bought it. It’s in pristine condition and I’ll probably spend the rest of the night obsessing on how beautiful the condition is. Enjoy these pics and Thank You Play N Trade! Game Data: …

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CCIE: BGP

CCIE: BGP

Unlink IGP’s, BGP does not use metrics to select best path. Instead, BGP is vector based. This path is determined with Path Attributes (PA’s). The default PA, if no others are set is AS-PATH. Shortest path to destination prefix is the best path. Building the neighbor relationship: TCP Port 179 (established based on neighbor address), Open, Established, and finally Updates (contains the prefix information). If there is a problem/error a “notification” message is sent. Keepalive is 60 and hold time is…

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CCIE: RIP

CCIE: RIP

Notes: auto-summary in RIP affects what is advertised, but not the local RIB. Preventing route feedback: Prevent router feedback (RIP) with static route to null0 or distribute-list (IN) on originating router. interface> ip rip advertise (interval different than the global) default sent out specific interface: use route-map that sets interface and default-information originate. DON’T FORGET ABOUT ROUTE FEEDBACK IN RIP! ACL to filter even/odd octets: ip access permit 0.0.1.0 255.255.254.255 : permit 3rd octet odd only ip access permit 0.0.0.0 255.255.254.255…

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