Cisco WAN :: RC E001 / E002 - BGP Multi-Layer Route Reflector Topology
Nov 23, 2011
I'm trying to figure out if the multi-layer Route-Reflector topology would work for me. Let say we have 2 Route-reflectors RC-RR1 and RC-R2 and all other router are their reflect-clients. Now I'm getting a new router RC-.E001 and would like to set new level of Route-reflectors. I'd like that now the router RC-E001 is a route-reflector client of RC-E002 (new level of RR) and RC-RR1, e.g. it will be a client of route-reflectors from different levels.
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Sep 12, 2011
If I have five iBGP routers in AS 64512 and one of the iBGP router has an eBGP peer to a different AS, which iBGP router (r1, r2, r4, r5, or r8) should I chose to be my route reflector and why? Also, what happens if the route reflector router fails? Do I designate a backup route reflector? I'm new to BGP.
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Nov 13, 2012
We are a service provider and we have presence across different data centres located across the country. Our core boxes are the mixture of Cisco VXR’s and 6513 switches which have MP-iBGP peering with the route reflectors. If a new client comes on board, a new VRF will be created to carry the client’s traffic and as a standard practice the VRF will be added to all the core devices across the network even if they don’t have a presence in a data centre.Now, I am designing a network for a client who has presence only at two fixed locations as shown in the attached diagram. We will be acting as a transit network between the client and another service provider. So, I have planned to use MP-eBGP between us and the other provider and default/static routes to the client’s network I don’t think will be an issue. Since the client has presence only at two locations, my design thoughts are to create a VRF and a Vlan and form an iBGP session only between the two routers and bypassing Route Reflectors. Created the VRF at BNE_R1 and formed MP-eBGP relation with the other provider and I can see some routes appearing via the peering which is normal and expected.
My problem is (not problem I don’t understand how this is happening), I created the VRF on Mel_R1 router and did not add any extra lines of configurations to BGP under that VRF instance and when I was checking some thing I accidentally found the same routes which appears on Bne_R1 is appearing in the VRF’s routing table via MP-iBGP session through route reflector. I can’t understand how this is happening, since I haven’t added any thing on the route reflector and some how its leaking traffic.
Is this normal??Is it’s a must / standard / Good Practise to add the newly created VRF across all the device which peers with the route reflector ??Is there a way to override the Route Reflector just for this client (VRF) and form a direct MP-iBGP peering directly with the devices involved.A network can be designed in much number of ways.
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Jan 20, 2011
how many sessions a BGP Route Reflector can support? is it 10, 100 or 1000 BGP sessions? What degradation of performance may arise in the case of a BGP RR sessions overload? Consider that the RR I'm deal with has both the control plane and teh forwarding plane. Which command I may use for get the output about BGP sessions resurces used level?
The following are the data about the RR:
Cisco 7600
WS-SUP720-3BXL
Version 12.2(33)SRD5
cisco CISCO7609 (R7000) processor (revision 1.2) with 983008K/65536K
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May 27, 2013
I have question regarding route reflector. In my MPLS core network ,we have two route reflectors. Two route reflectors and each PE routers are belonged to a peer group. Route reflectors are Cisco 7301. IOS 12.3. I have Hardware maintenace on one Routereflector. How can I do that without interupting the end customer trafic.
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Mar 24, 2013
I've been taught/under the impression that vlans and stp stay in the access layer to prevent bridging loops and broadcast storms from taking down the whole network. Well I was reading about backbonefast and how it "Enables fast convergence in the networkbackbone or core layer switches after a spanning-tree topology change occurs." Now I thought that from the distribution layer up we use a routing protocol.
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Jan 5, 2011
I'm thinking of connecting a branch office to the main office with just using multilayer switch. The sites will be connected using ethernet leased line, so I'm thinking of connecting it directly to the switch.
We're running eigrp on our network so the Multilayer switch will do the eigrp routing.Thinking of using C3750E-24TD-E (IP Services) as the multilayer switch. Can this work or do I still need a router to terminate the WAN?
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Oct 13, 2012
I config the routers with EIGRP and also write Static route between two PC before remove the link between router0 and router1 , destination is reachable , but when remove this connection , packet from pc1 to pc0 will drop in a loop and never reach to destination , is it possible to have a Link state routing protocol and static route at the same network like this scenario , how to prevent loop in this topology static route is configure as bellow :
router0 <==> router 1 <==> router2 <==> router3 <==> router <==>pc1
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Jun 21, 2012
is it possible for a client to choose a WAN to use when being routed through a Multi-WAN router? Something that could be configured as default route in linux or default gateway in winxp ?Or is this decision totally up to the router itself ? [code] Could now a client on the subnet 192.168.0.0/24 choose 1.1.1.1 as a default route for example? And if not, could this be possible if the router hat some secondary internal IPs for both WAN interfaces.
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Mar 18, 2012
I want to setup VLAN with the switches SG300 and SLM2024. What is the suggestion to connect these 2 switches. We have the Juniper net screen.
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Nov 15, 2011
I have a question if I Stack a Catalyst 3750 L3 with a Catalyst just L2, will we able to use all L3 capabilities?
Switches are
WS-C3750G-24TS-E1U
WS-C3750V2-24PS-S
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Apr 3, 2012
I am taking an introduction class to CCNA and we are focusing on the Application Layer,and I'm having some difficulty in understanding what is an Application Layer Service. Is the Application Layer Service the same as Application Layer Software?
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Jun 24, 2011
I've enabled antispoof on all interfaces on asa 5510.If you start a traceroute to a network on the default route, everything works, since replies comes to an interface with route 0.0.0.0/0 defined.If you start a tracer route to a network that is NOT on the default route (let's assume coporate MPLS), you only get response from first carrier router, the other are discarded because of anti spoof violation.
I have ICMP inspection and icmp-error inspection enabled.
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Mar 20, 2012
i have an issue with the lms 4.2 Topology Data Collection. After installation the Topology Data Collection was running normaly, but since first server reload the Topo Data Collect under Inventory > Dashboards > Device Status > Collection Summary is "frozen".Is there any option to stop this process elsewhere? I cannot find anything under jobs in running state or so. Clicking on Schedule only give me the option to start data collection, but lms always returns that the process is running.
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Nov 26, 2012
1)i have problem in LMS 4.2 , he shows most devices not connected to topology sitting lonly even though the have cdp enable , how to force these to join the topology
2)why some devices are shown unreachable , even though i can ping them from lms server and gets reply, also they have community and cdp configured
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Dec 19, 2011
On a LMS 4.0.1 :I want to know what is the right way to change the telnet program on the campus mgr map (topology services map), when right-clicking a device icon and selecting telnet.I would like to use a tool of mine, and not to launch a telnet command from the IE browser.I changed the default telnet of Windows in the registry, but the program is still launched as a telnet URL in the browser and this is not what I would like to do.
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Mar 12, 2012
The regular problem with the LMS topology and WAN Links when you see the branches are disconnected from the HQ BUT in my case the branches are already connected via Layer2 links but unfortunately some intermediate layer2 modem/switch exist in some branches which prevent CDP discovery but you will find both HQ and branch router in the same subnet .
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Jun 20, 2012
i have only 1 switch 2960 POE at customer enviroment.i did run topology service and checked on the right side POE CAPABLE Devices
it shows me that i have 4 switch POE while actually there is only 1 switch POE in real enviroment.
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Feb 4, 2012
have ether-channel across 2 switches?i am new in cisco LMS . now i am in client site installing cisco LMS 4.1 in UCS server-rack version. we did it well for the installation, and the LMS working properly until i cannot open topology service.
i attached the error message
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Feb 14, 2012
I have a customer who wants to disable cdp on all switches for securtity reasons. The same customer has also LMS 4.0 installed.
When disabling cdp, does it affect the topology services on LMS? Can you still see the topology tab on device manager or the topology map of the entire network?
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Jun 12, 2012
I have problem with topology view in LMS 4.2.1, it doesn't show the tunnels connecting branches, though both devices are shown in sh cdp neighbour command output. If I choose Show Devices in Admin > Collection Settings > Data Collection, it is showing cdp neighbours correctly.
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Feb 12, 2013
I am running LMS 4.2 , using that i am monitering some switches . I am using topology services also. In that i am getting veiw of all connected devices with links. But bandwidth utilization is for those links are not showning in topology veiw .
Is there any settings to be done in LMS 4.2.2 or any configuration changes to done on my switches ? to find the traffic flow bandwidth utilization.
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Sep 19, 2011
I installed LMS 4.0.1 and every module works from the local server. Http login from a remote system, topology services does not start, complains about java version. I followed the link to install the java version, it then complains about some Ansiserver stuff.
the client os is win7 64 bits, eplorer version is 7.
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Jun 14, 2012
i have a problem that i see the devices by ip not hostname in devices report and topology and i checked in device discovery to appear by hostname
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Nov 7, 2011
When i try to launch topology services in LMS 4.0 i get prompted to install a java plugin. When i install this it tells me to restart the browser but nothing is changed, it asks me if i want to install the java plugin again.
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Mar 24, 2013
I'm trying to make an attached topology. This router should be attached to 2 different ISPs on both WAN interfaces (ISP1 with IP address - A.B.C.D, and ISP2 with IP W.X.Y.Z) and I want to use DMZ, too. My idea is to make a L2/L3 segmentation with 2 VLANs - Vlan RED for DMZ (private network 192.168.1.0/24) and vlan BLUE for Internal network (network 192.168.2.0/24). I checked in the manual that vlans are supported, but I can't see anything about 802.1q, can I use one trunk port or I should use 2 physical cables?
There should be inter-vlan routing and basic stateful firewall, so PCs in Vlan Blue should be able to initiate connections to DMZ servers, but the opposite should be denied. Router should make a port forwarding on its both WAN interfaces and forward incomming traffic (from Internet) to DMZ servers (with NAT). Both DMZ servers and internal PCs should have an internet access with NAT over both WAN uplinks.
Can I use RV042G for this setup and if not at all - are there any cisco SMB device which can do this?
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Oct 17, 2011
I work with the topology view in LMS 4.1. I can see all the links between the differrent switches (N7K, 3750, 3040).I miss only the links between the different N7K's. This links have one special thinks: they are configured as " rate-mode dedicated force" In the N7K cli this interfaces are displayed with the SN too.
sw-bb13# show cdp ne.The links to sw-bb11 and sw-bb21 are not painted in the topoloyview.
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Jan 15, 2012
Attached is BGP confederation configuration and Topology. They are taken from "Routing TCP/IP Volume 2" book.AS 65000 is designed as a backbone AS connected to non-backbone AS 65535, 65534 and 65533. All are member AS's in AS 1200.I have couple of questions as i think some parts of Sunshine's and Talisman's configurations are incorrect.
1. The next-hop-self keyword is mentioned only for Panorama router, why the keyword wasn't mentioned for Nakiska and Talisman routers? .. As we know, the next hop is preserved throughout the confederation, therefore, next hop self should be configured in all member AS's inside the confederation. The same thing with Talisman, why the next hop keyword wasn't mentioned for Lakeridge and Sunshine?
2. Why the remote-as keyword wasn't mentioned for Panorama in Sunshine's configuration while the keyword was mentioned correctly for every neighbor routers in Talisman's configuration?
3. I don't understand the below statements that are stated in the book, as it conflicts with the rule "MEDs are preserved throughout the confederation"
"AS 65000 can safely send MEDs to AS 65535. A route that includes 65000 in its AS_PATH is not accepted by Sunshine or Talisman, so MEDs sent from those routers to AS 65535 are not seen by other member AS's".
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Jun 21, 2012
Using Topology I can show device view from all my managed VTP domains. I don't understand why all links are "not in network"!?
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May 22, 2011
I am trying to configure MSTP on Layer-2 network at work. We have multiple switches connected on Wireless point-to-point links with redundent links.MSTP is configured with multiple regions. All the servers are located in RegionA and other regions are connected to RegionA via multiple links.
There are 3 SG-300-10 switches in RegionA --- SwitchA_1, SwitchA_2 and SwitchA_3.One of the simple regions (RegionB) has a single SF-300-08 switch (SwitchB) connected to SwitchA_2 via port e7 and SwitchA_3 via port e8. Hello Time, Forward Delay and Max Age are at their default values of 2, 15 and 20 respectively. The link between SwitchB (port e7) ---- SwitchA_2 is the primary link with cost 200,000 and the link between SwitchB (port e8) ---- SwitchA_3 is the backup link with cost 500,000.
The log on SwitchB is shows in the table below. As it is seen from the table there are frequent topology changes for very short duration (1-4 seconds) before the topology settles back to the configured one. (Primary link forwarding and secondary link blocking). During this time there have been no link failures reported.Same thing is also observed within RegionA (SwitchA_1, SwitchA_2 and SwitchA_3 are connected to each other).
How to stop these frequent topology changes? The topology changes within RegionA causes a lot of PPPoE sessions to reset and re-establish.Is there any way to find out what triggers these topology changes?
21474646232011-May-24 13:54:15Warning%STP-W-PORTSTATUS: e7 of instance 1: STP status Forwarding21474646242011-May-24 13:54:15Warning%STP-W-PORTSTATUS: e7 of instance 0: STP status Forwarding21474646252011-May-24 13:54:15Warning%STP-W-PORTSTATUS: e8 of instance 1: STP status Blocking21474646262011-May-24 13:54:15Warning%STP-W-PORTSTATUS: e8 of instance 0: STP status Blocking21474646272011-May-24 13:54:13Warning%STP-W-PORTSTATUS: e8 of instance 1: STP status Forwarding21474646282011-May-24 13:54:13Warning%STP-W-PORTSTATUS: e8 of instance 0: STP status Forwarding21474646292011-May-24 13:54:13Warning%STP-W-PORTSTATUS: e7 of instance 1: STP status Blocking21474646302011-May-24 13:54:13Warning%STP-W-PORTSTATUS: e7 of instance 0: STP status Blocking21474646312011-May-24 12:53:22Warning%STP-W-PORTSTATUS: e7 of instance 1: STP status Forwarding21474646322011-May-24 12:53:22Warning%STP-W-PORTSTATUS: e7 of instance 0: STP status Forwarding21474646332011-May-24 12:53:22Warning%STP-W-PORTSTATUS: e8 of instance 1: STP status Blocking21474646342011-May-24 12:53:22Warning%STP-W-PORTSTATUS: e8 of instance 0: STP status
[code]....
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Jun 7, 2013
I'm designing a new topology to access to the Internet using Cisco2921 NAT and MS ISA Firewall. I'm going to use ISA as a proxy to public some internal services and to provide internet access for my users. ISA won’t use NAT. It will route traffic. Cisco 2921 will handle NAT, ISP Failover and IPSec VPN to datacenters.
Cisco 3750 will route outbound internal traffic.My routing for internal users on Cisco 3750 will look like this: [code] My question is about route from Cisco 2921 to my local network 192.168.0.0/22.If I use this route, I'll restrict my traffic from datacenter to go through ISA server BUT all responses from the Internet will go directly to 3750 too.I doubt about security and functionality of such solution. Of course I will public my internal resources to internet that way. It is on Cisco 2921
ip nat inside source static tcp 172.16.0.2 80 (my external IP) 80.I could use PBR to divide my traffic from datacenter and other traffic, but I don't know how to use PBR with IPSec VPN traffic.
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Oct 14, 2012
After some time LMS stops to refresh network topology (not changing colors for devices which lost/found). However, if I restart topology services devices are refreshed.
Checked the processes. Everything is fine but there is a process named "1018". But I did not found any job with this number.
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Sep 10, 2012
I have problem with LMS 4.0 when i connect the topology from client PC. On client PC (Install windows 7), I had some check:
- Telnet LMS 42342 ------ OK
- Add host in Program files/system32/drivers/etc: 10.10.10.14 LMS
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