About francisco_1

francisco_1 · ‎08-08-2018

you welcome

francisco_1 · ‎06-21-2018

have you tried sending more frames? you seeing packet loss? jumbo frames can be up to 9216 bytes in size but you have to take in to consideration the addtional headers 9216 data + 8-bytes ICMP + 20-bytes IP = 9244-bytes. if you have an end system with an MTU of 9216-bytes the command you should use to test end to end jumbo frame connectivity would be ping <ip-address> df-bit packet-size 9188. That way when the 8-byte ICMP and 20-byte IP header are added, the packet size will be 9216-bytes. The other area to watch out for is Control Plane Policing (CoPP) on the Nexus. The Nexus switches runs CoPP by default to limit traffic hitting the CPU on switch supervisor. I've seen issues in the past with ICMP as the default value used within the policer quite low, and if you're specifying large packet sizes with the ping it's possible CoPP is dropping the traffic. You can use the show policy-map interface control-plane | in "class-map|violate" command to quickly check if you have drops in any of the classes.

francisco_1 · ‎11-04-2014

not sure if this is the right community to post this kind of question but i am after some example of vbscripts to detect routing change for example like to know when someone add a new route entry, advertised in to our campus networks, would like to know the no of routing entries being added, now of routes in the routing table /etc including vlan changes, RPF failures within the environment and number of entries in our multicast table including new additions. any example you can provide will be useful. thanks in advance.

francisco_1 · ‎11-04-2014

Hi, not sure if this is the right community to post this kind of question but i am after some example of vbscripts to detect routing change for example like to know when someone add a new route entry, advertised in to our campus networks, would like to know the no of routing entries being added, now of routes in the routing table /etc including vlan changes, RPF failures within the environment and number of entries in our multicast table including new additions. any example you can provide will be useful. thanks in advance.

francisco_1 · ‎01-03-2014

As mentioned i think prepend is the way forward. For example, you have the Class C Subnet (1.1.1.0/24), and you are advertising this subnet through both ISPs and prepending it on ISP used as redundant link to look worse, or maybe you could Spilit the Subnet and advertise more specific Subnet our your primary ISP to look better from the Internet a /25 out your primary link and less specific out your backup to give you the required redundancy you need.

francisco_1 · ‎03-04-2013

I have noticed same behavior on 6k code ipservicesk9-mz.122-33.SXI10.bin

francisco_1 · ‎02-27-2013

post output for command "show show queueing interface GigabitEthernet2/41"

francisco_1 · ‎02-26-2013

mmmm to be honest your question is not clear. which slb are you using? F5? One of the default health monitor is tcp_default and the slb sends a tcp syn, server respond with syn-ack and slb send a reset and mark the health checking success. it does it the default time 5 seconds it does this level of checking.

francisco_1 · ‎02-26-2013

The default gateway on the switch is for management purposes only. If you don’t input a default gateway on the switch, you won’t be able to manage it via IP. the Hosts connected to the 3560-1 have their gateway set, the switches uses it layer2 cam table (forwarding table this is not a layer3 routed table) to forward frames to the destination.

francisco_1 · ‎02-26-2013

so the next step i would take is confirm these servers are sending multicast traffic /etc. you could try tcpdump on the servers and also use netstat to verify few things like netstat -g shows which interface & mulicast group they are joining /etc user1@servers1:/home/user1> netstat -g IPv6/IPv4 Group Memberships Interface RefCnt Group --------------- ------ --------------------- lo 1 all-systems.mcast.net eth0 1 239.255.254.255 eth0 1 239.2.11.71 eth0 1 all-systems.mcast.net eth1 1 all-systems.mcast.net lo 1 ipv6-allnodes eth0 1 ff02::1:ff59:7631%lo eth0 1 ipv6-allnodes eth1 1 ipv6-allnodes eth3 1 ipv6-allnodes eth4 1 ipv6-allnodes eth2 1 ipv6-allnodes eth5 1 ipv6-allnodes eth0 1 239.2.11.71 user1@servers1:/home/user1> netstat -s pExt: InNoRoutes: 0 InTruncatedPkts: 0 InMcastPkts: 4246526 OutMcastPkts: 944798 InBcastPkts: 576198 OutBcastPkts: 0 InOctets: 8140682997 OutOctets: 11416376132 InMcastOctets: 173821630 OutMcastOctets: 54146926 InBcastOctets: 83425218 OutBcastOctets: 0

francisco_1 · ‎02-26-2013

it's normal to see some level of drops expecically when you have applications that create bursty traffic and take in tou consideration you're are buffering.

francisco_1 · ‎02-26-2013

see this http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note09186a008059a9df.shtml hopefully it might help

francisco_1 · ‎02-26-2013

have you tried enabling mrouter on a layer2 port connecting your switches?

francisco_1 · ‎02-26-2013

you gonna have to engage TAC.

francisco_1 · ‎02-20-2013

good question and we had this issue a while ago and option were to upgrade to 720 3CXL and due to costs, we ended up taking partial routing table with a default routes. designed our routing policy to only accept routes up to 3 AS hops ands that reduced the size of the routing table on the sup 720 cards.

Date Registered	‎10-12-2007 01:55 AM
Date Last Visited	‎08-10-2018 12:04 AM
Total Messages Posted	1,237
Total Helpful Votes Received	647

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