Hello Jonathan, yes the C3850 can run BGP and EIGRP or BGP and OSPF at the same time. Of course you cannot expect teh C3850 to be able to support a full BGP table that is made of 780,000 routes.   within the prefix limits of the platform you can use two routing protocols.   Hope to help Giuseppe   ... View more

Hello Rick, yes I have had  similar thoughts while writing my post. We and the networking books should say a router operates at OSI layer3 when routing and forwarding  user traffic, but it is not limited to OSI layer3, and it implements a TCP/IP stack  for different aspects like management, handling routing protocol messages and so on.   Best Regards Giuseppe       ... View more

Hello, looking at the 10G DWDM datasheet https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/dwdm-transceiver-modules/data_sheet_c78-711186.html?dtid=osscdc000283   You can notice they use a naming convention with a . after the first two digits. DWDM-SFP10G-XX.XX   So my suggestion is to look again inserting a dot use the string DWDM-SFP-36.61 to make the search   Hope to help Giuseppe   ... View more

Hello Paul, you have been very kind to provide the console logs. From what we can see the image file is loaded and de-compressed without errors. Then when the switch tries to boot it fails.   Edit2: use the recovery procedure provided by Rick to load the old image on the switch. After booting with the old image you can issue a show version there is a line that will tell you how much memory is on the switch main cpu. The switch is likely with a too small RAM to run the 15.2 image.   Edit3: this is the link from Rick's post: [second edit] And this link describes the process to recover a 2960 from a failed software upgrade https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960/software/release/12-2_53_se/configuration/guide/2960scg/swtrbl.html#22506   Edit4: the Xmodem protocol uses the console cable and using the 9600 speed it will take hours to load the image on flash. Before attempting to load the old image file verify that you have enough free space on the flash. If the space is not enough you should delete the files related to image 15.2 note that actually you have a directory and the true ios image in within it 5 drwx 512 <date> c2960s-universalk9-mz.152-2.E9 However the boot command points to the correct path in your log files so yes it is not good for your switch. >> flash:/c2960s-universalk9-mz.152-2.E9/c2960s-universalk9-mz.152-2.E9.bin       Hope to help Giuseppe   ... View more

Hello Sanket, you can use show inventory to find out the part number of the optics. Then you can look in the optical matrix tool using the part number to find out the declared max distance.   for DWDM https://www.cisco.com/c/en/us/support/interfaces-modules/dwdm-transceiver-modules/model.html?dtid=osscdc000283   by using show controller you can see the tx power and the rx power levels.   Hope to help Giuseppe   ... View more

Hello Paul, Rick is referring to the RAM of the switch CPU not to the flash drive.   And Rick is right that 512 MB of DRAM are required and 1GB is recommended.   Edit: I cannot see your console log messages file attached in this thread. May you attach the file as text file to a new post?   Edit2: use the recovery procedure provided by Rick to load the old image on the switch. After booting with the old image you can issue a show version there is a line that will tell you how much memory is on the switch main cpu. The switch is likely with a small RAM to run the 15.2 image.   Hope to help Giuseppe   ... View more

Hello Thorsten, I think the summary routes can be enough to pass the RPF check as they are more specific then a default route.   >> What we need is that the firewall forwards this summary routes between the sites. Yes I do agree on this.   Hope to help Giuseppe   ... View more

Hello Lionel, I would not expect to see an IP address defined under gi0/1/0.   However, the Radius server is attempting to push some configuration statements to your router :   *Aug 22 10:23:53.558: RADIUS: Cisco AVpair [1] 31 "ip:ip-unnumbered=Loopback1245" *Aug 22 10:23:53.558: RADIUS: Vendor, Cisco [26] 32 *Aug 22 10:23:53.558: RADIUS: Cisco AVpair [1] 26 "ip:addr-pool=ippool1"   Can you check if the loop1245 and the the ip address pool ipool1 exists in your router configuration ?   Because if they do not exist this can be the root cause of your issue   Hope to help Giuseppe   ... View more

Hello Nicholas, in what device have you applied this change on Nexus2 ?   >> vlan 101 vn-segment 100194   it is appplied to L2 brodacast domain vlan 101 not to SVI interface Vlan 101 . is it correct ?   Best Regards Giuseppe   ... View more

Hello Eblodgett, if you have 10 remote sites there is not a strict need for partitioning. However, if the provided service is port based all you need to do on HQ routers  is to create subinterfaces one for each remote site using a different Vlan -id. Please note that the remote site must use a subinterface with the same Vlan-id to build a working configuration. (again for port based service)   Hope to help Giuseppe       ... View more

Hello snadkarni, routers are layer 3 devices but the router main cpu implements a full TCP/IP stack for example we can telnet or SSH to them. Telnet uses TCP 23. SSH uses TCP 22. Similarly most routing protocols use some form of L4 encapsulation RIP uses UDP port 520 EIGRP is protocol 88 over IP OSPF is protocol 89 over IP.   so listening to TCP port 179 is not an issue for routers as control plane messages are processed by main cpu TCP/IP stack.   Usually, BGP sessions can be formed only with manually configured BGP peers. The BGP peer must use the expected source address, the expected destination address and must declare to belong to the BGP AS number configured on the local router. So the router will open the TCP 179 port only on the local address used for the BGP session. The local address can be different for different BGP sessions: a loopback address for iBGP sessions and the border interface(s) for eBGP sessions.     Hope to help Giuseppe   ... View more