Prepending
Hi We have witnessed a lot of prepending in the last days, we got a few internet routes that have 30...200 prepends, did you face the same issue? Regards Mihai
BGP Route Monitoring
Hi I am looking for a route monitoring product that does the following: -checks if a specific bgp route from a specific neighbor is present the BGP table (in some vrf, not necessarily internet routed vrf) of an ASR9K running IOS XR -sends a syslog message or an alarm if the route goes missing The use case is the following: we are receiving same routes over 2 or more bgp peerings, due to best route we cannot really see at the moment if one of the routes ceased to be received over a certain peering. Alternative approach: a product that measures the number of bgp received prefixes from a certain peer. Do you know of such product that is readily available and does not require ssh sessions to the routers and parsing the outputs? I am trying to find a solution that does not require much scripting or customization. Many thanks. Regards Mihai
load balancers convergence (Radware)
Hi, Sorry if this is not the right list to post but it's the last resort and any clue would be highly appreciated. I am new to LBs world and have the following active-standby topology (Alteon 5524): Router1Router2 | | | | eBGPeBGP | | | | Alteon1(act)Alteon2(stb) | | |___| | | WEB servers - BGP local-pref is higher on the R1-A1 session. - VRRP priority is higher on Alteon1. - both Lbs advertise the same VIP address in BGP. - NAT is configured for WEB servers IPs. I am using these devices to load balance HTTP traffic and have the following issue: 1. Alteon1 fails and the traffic moves to Alteon2 without problems. 2. After Alteon1 recovers, it becomes the VRRP master due to higher priority, but the BGP session between Alteon1 and Router1 establishes after VRRP preemption (more than 1 minute after A1 becomes master) and the traffic gets dropped. I tried to use the hold-off timer to delay the VRRP preemption to match the BGP session establishment but still have ~30s downtime. Creating a direct link and BGP session between Alteons does not help as the traffic will be asymmetrical and is dropped on Alteon1. Regards
Re: 80 km BiDi XFPs
http://www.fiberworks.eu/Webshop/Optical-transceivers/SFP-Bi-Di-/-GPON/Gbit-Ethernet-Bi-Di-1310/1550/SFP-BiDi--125-Gbps-GigE--DDM--SM--80km-Tx-Rx1310-1550nm--26dB--LC-SFP-GE-BX80D-35-p018066.aspx already in production for 2 links On 04/05/2013 05:50 PM, Jerimiah Cole wrote: On 04/02/2013 05:15 PM, Frank Bulk wrote: Is anyone aware of a reputable supplier of 80 km BiDi XFPs? My regular supplier of generics doesn't have an option for us, but I would really like to avoid leasing additional fibers. I'm looking at a data sheet from Transition Networks that lists 80 km (24 dB) and longer. I've used some of their SFPs and media converters without trouble, but not these in particular. http://www.transition.com/TransitionNetworks/Products2/Family.aspx?Name=TN-SFP-xxx-Simplex -- Mihai
Re: bidirectional fiber inline amps.
specifications in lenght are for kids, adults use budgets :-) bx-d bx-u form cisco have a budget of 16dBmW (max), power form -3 to -9dBm and sensivity to -19dB. So if the fiber is under -10dB (this means roughly 10/0.25dB per km SM att) you might see the light at 40km, I have a stable link for 37km whith stock bx-d bx-u On 02/19/2013 11:15 PM, Eric J Esslinger wrote: Didn't see those. Thanks. Idiot moment for me. __ Eric Esslinger Information Services Manager - Fayetteville Public Utilities http://www.fpu-tn.com/ (931)433-1522 ext 165 -Original Message- From: Jared Mauch [mailto:ja...@puck.nether.net] Sent: Tuesday, February 19, 2013 2:43 PM To: Eric J Esslinger Cc: 'nanog@nanog.org' Subject: Re: bidirectional fiber inline amps. On Feb 19, 2013, at 3:30 PM, Eric J Esslinger wrote: Due to some bundle size restrictions, we are looking at converting some runs over to use bi-directional fiber sfp's (the Cisco version is GLC-BX-D/GLC-BX-U). However a couple of our runs are farther than the spec 6.2 miles. Is anyone aware of a vendor that makes an inline bidirectional amp for this sort of application? I did some digging but either they do not exist or my google fu is weak today. So you really just want the 20km optics: GLC-BX-U20 GLC-BX-D20 Most places also make 40km and 80km optics of the same sort. - Jared This message may contain confidential and/or proprietary information and is intended for the person/entity to whom it was originally addressed. Any use by others is strictly prohibited. -- Mihai NECSA rcs&rds Ploiesti
regarding 188.24.168.0/21
Hi list Any help will be appreciated, it seems that apple is filtering prefixes for untraceable reasons I wrote emails to apple-...@apple.com dr...@apple.com but no answer. Staring about 2 weeks ago we encountered several complaints from our customers which are using 188.24.168.0/21. The prefix is allocated to our residential customers, dynamically via pppoe. Actually they are not able to connect AppStore and associated resources like developer.apple.com from their IOS terminal phones or tablets, nor using iTunes or browser from their respective operating systems. Using tcpdump we saw that 17.154.66.17 is not responding to client request. IP 188.27.253.245.63289 > 17.154.66.17.443: tcp 0 Furthermore we did manage to ping hosts from 188.24.168.0/21 using a looking glass server (4.69.185.226) from LEVEL3 San Jose which seems to be last hop provider to apple network. Ping results from San Jose, CA to 188.27.248.26(188-27-248-26.rdsnet.ro) icmp_seq=0 time=188 ms statistics 1 packets transmitted, 1 packets received, 0% packet loss rtt min/avg/median/max/mdev/stddev = 188/188/188/188/0/0 ms Regards, -- Mihai NECSA network engineer @AS8708
