Cisco :: BGP Routes Not In Routing Table?

Feb 4, 2013

We have a BGP / OSPF configuration as shown in the topology picture. When the connection towards Internet is taken down, we expect the traffic to be forwarded toward WAN 2 (preferred) or WAN 1. The problem is that the BGP learned routes disappears when the Internet connection is taken down. The IP routing table on R2 only shows internal networks and the networks between R2 and WAN 1 and 2. No routes to internet is shown. We run "show ip bgp neighbors <ip-to-wan-1-router> received-routes" it contain internet routes. And when we run "show ip bgp neighbors <ip-to-wan-1-router> routes" it contains no routes at all.

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Cisco :: How To Remove These L Routes In Routing Table

Apr 2, 2013

viewtopic.php?f=33&t=24000

How can you remove these "L" routes in routing table?

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Cisco VPN :: 2621 VPN Tunnel Drops Routes Out Of Routing Table

Dec 11, 2011

My main issue was trying to connect virtuelly via GNS3 and my router setup on it. I have three Cisco 2621 XM routers set up. They all came with 2 Fast Ethernet ports. However, only one of them has a Serial port. So, what I'm doing is connecting the routers together with the fast ethernet ports using crossover cables. So, I baselined two routers to start with. Very simple AAA, set up IP HTTP server, IP HTTP Secure Server, etc. Privledge lvl 15 access, etc.
 
I then set my Router A's inside Fa0/1 port with a 192.168.1.0/24 network. The outside port Fa0/0 is 10.0.0.0/30 network.Router B is set up similar, 192. 168. 2. 0/24 insice Fa0/1, Fa0/0 is 10.0.0.0/30 network outside. So, three networks 192.168.1.0, 192.168.2.0, 10.0.0.0 network. [code] I then repeated the same on Router B, just transposing 2.0 network for interesting traffic, and Peer 10.0.0.2 for the Fa0/0 interface on Router A.When I "test" the tunnel, I get an error message. So, since I'm connected to Router B (which was working, had routing, and had Router A's network 1.0 in it's routing table), the error msg says that I need to add a route into the routing table (192.168.1.0). It was there up until I attempted to put the VPN in place. It's like it stopped the routing.
 
At face value, it looks like this should be working! But when I debug the ospf process, it looks like hello packets aren't tranversing across to the other side. Is it because I just have the 192.xxx.xxx.xxx networks as "interesting" traffic? Can I have multiple networks marked as "interesting"? I thought that's what the peer statements were doing to allow the tunnel to be established.

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Cisco Routers :: RV180 - Subnet Calculation In Static Routes And Routing Table

Jan 3, 2013

I've been playing around with the Cisco RV180s for a while now and have come across a problem with the subnet calculation in the static routes and routing table. Essentially, if I configure up a static route for a /16 it's entered in the routing table as a /13. If I add a /24 it's entered in the routing table as a /16. I haven't tested every subnet size and combinations but this looks like a fairly fundamental maths bug.
 
As a side note, I notice that the 1.0.1.9 release notes state the removal of SSH Server, however, I can not find any reference to it's existance prior to 1.0.1.9, did/does it exist in 1.0.0.30 and if so where? .
 
Screenshots are below and an extract from the configuration file for reference.

From the config file:
 
route = {}
route[1] = {}
route[1]["active"] = "1"
route[1]["dstIpAddr"] = "8.8.0.0"
route[1]["gwIpAddr"] = "192.168.1.250(code)

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Cisco WAN :: 3825 Will Not Add Routes To Topology Table From Eigrp Neighbor

Mar 13, 2013

I have a 3825 running c3825-advipservicesk9-mz.124-24.T8. It is configured as an eigrp stub advertising only its connected and static routes. There are three WAN connections using a metro ethernet service. Two are data, one for voice traffic. The primary data connections run to two WAN edge ASR1002 routers.
 
The primary data connection (Gi0/1.943) is 20 Megs, the secondary data connection (Gi0/1.944) is only 15 Megs. Before the secondary connection was in place I only had routes to our backbone via Gi0/1.943 and everything was working great. Some time after the secondary data connection was turned up the routes to the backbone through Gi0/1.943 disappeared from the eigrp topology table causing all data traffic to flow through the less desirable secondary Gi0/1.944 interface to our backbone.
 
There is a good eigrp neighbor relationship between the 3825 and the ASR connected to Gi0/1.943, but if I show ip protocols it does not list the ASR as a data source. I know that the ASR is advertising its routes because I can see the updates coming from it if I debug ip eigrp. For some reason they are just not being added to the topology table by the 3825, not even as a feasible successor.
 
I have shut/no shut the interface multiple times at both ends during troubleshooting and I also reloaded and upgraded the code on the 3825 from 12.4(24)T to 12.4(24)T8. We also contacted the metro ethernet carrier to see if they had a policy that could potentially be blocking the traffic (no). My colleagues and I are just not seeing any feasible reason why these routes are not being added.

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Cisco WAN :: WS-SUP720-3B - 2 Full BGP Table - Maximum Routing Table?

Jan 16, 2013

In datasheet of  WS-SUP720-3B - link- was said that are only supported around 256K routes (fib?rib?).With this value I can't get 2 full bgp - that is around 850K ..
 
The supervisor is that control this or just memory ? I said this because I have a 7204-npe-g1 whith 2 fullrouting and 1G of and he are ok..

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Cisco WAN :: EIGRP 101 - Prefer External Routes Versus Internal Routes?

Apr 8, 2011

Is there a way in EIGRP to prefer external routes versus internal routes. EIGRP always picks up internal routes as long as they are available, no matter if external routes have better metric. Our Scenario is that we have DMVPN hub and spoke topology running EIGRP 101. The Core routers also on EIGRP 101 prefer EIGRP 101 routes. We have the new MPLS network running BGP and redistributing these BGP routes into EIGRP 101. The core routers prefer EIGRP 101 routes (internal) to redistributed BGP (external) routes.

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Cisco Switching/Routing :: 1941 / Policy Based Routing With Two Default Routes

Jun 24, 2012

I have a 1941 router configured for Policy based routing with two ISPs.Two static default routes configured to point the gateways of respoective ISPs with same metric.But the problem is, packets are going throug the one ISP only while doing traceroute.
 
N/W connectivity:
 
ISP1----->                <----------------------> LAN1   
               |  Router |
ISP------->                <----------------------> LAN 2
 
Below is my configuration :
 
Current configuration : 5958 bytes
!
! Last configuration change at 05:18:56 UTC Mon Jun 25 2012
!
version 15.0
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption

[code]....

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Cisco Switching/Routing :: 3560E - HSRP Gateway Failover And Routing Table

Nov 12, 2012

We have two Cisco 3560E layer 3 switches at the core of our network. The switches are configured as an HSRP pair and the clients on our network point to the HSRP address as their default gateway. So if CORE-A dies, then CORE-B will pick up the address and the default route for the clients will continue to be available.We also need to specify a few static routes on the core switch to allow us to get to specific networks. Is there a way to do this so that the routes failover in the same way that the default gateway does?

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Cisco Routers :: RV 042 V3 Advance Routing Feature Causes Static Routing Table Not To Appear

Jan 31, 2012

I tried the "Advanced Routing" Feature over the RV-042 V3 Dual WAN VPN Router , And the New IP Subnet i added ( 10.0.7.0 ) in the Static Routing Table does NOT Appear in the Routing Table of the Router. Please review the attached Print Screen for both the Static Routing Entry Configuration & the Routing Table of the RV-042 Router.

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Cisco Switching/Routing :: RIPv2 Routers Setting Routing Table For R3

Dec 5, 2012

I started using RIPv2 on Packet Tracer. I got two subnets to connect with two routers. After I completed that, I decided to add a third router. How to setup the Routing Table for atleast R3 ?

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Cisco Switching/Routing :: 2911 With IOS Version Is 15.1 - Routing Table Not Updating

Oct 2, 2012

I am using Cisco 2911 & IOS version is 15.1. My problem is that after some days (e.g. 15-20 days), the routing table suddenly stops updating & then I have to enter the default route again to make it up. I am using Track 1 to track default route here. After primary link goes down, the Track is also going down but after coming the primary link up, the track is not coming up. So, I have to add the default route again to make it up.

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Cisco Switching/Routing :: GNS3 - Stub Router Not Updating Routing Table - EIGRP

Nov 14, 2012

We have small which I'm looking to implement and have built this on GNS3.
 
We have:
 
Router A in site 1
Router B in site 2
Router C in site 3
 
Router A and B are connection via a point to point 100M link and from Router C we have a 2 point to point one of which is 5Mpbs and going to Router A and Router B.
 
For Router C to reach Router A network it will go via Router B and these are 100M connection. When the link between Router A and B goes down. Router C should update and start using the 5m route.
 
For some reson, the routes are not updating. I have to do 'clea ip eigrp ne' for the routes to update and if I reload the routers all works well, it seems the problem is intermittent.

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Cisco Switching/Routing :: Filter A Specific Host(s) From OSPF Routing Table On A ASA 5550 (ABR)?

May 22, 2013

I am attempting to filter a specific host(s) from my OSPF routiing table on a ASA 5550 (ABR) using LSA prefix lists.  However, when I look at the other routers in that area, I notice that ALL LSA type-3's are being removed (10 hosts are now missing from the routing table). I have verified the filter is working on the ABR, but I can't figure why ALL hosts/routes that were coming into the area are now being filtered instead of the specific one that I want to filter out.
 
Here is the config on the ABR:
 
prefix-list pdm_pl_000 seq 10 permit 206.253.180.137/32
!
!            
router ospf 1
network 10.0.0.0 255.255.255.0 area 0
network 10.150.10.0 255.255.255.0 area 10
network 10.150.252.0 255.255.255.224 area 10

[code]....
 
The 206.253.180.137 host is actually coming from Area '3'.  Am I doing something that is removing all type-3 LSA's?

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Understanding NAT Table And Its Chains (pre-routing / Post-routing And Output)?

May 28, 2011

I'm learning about iptables, but I don't fully understand the chains of NAT table (prerouting, postrouting and output).I'm specially in doubt about prerouting and postrouting. As far as I know, DNAT can be made with prerouting and SNAT can be made with postrouting, so I think prerouting is for input and postrouting is for output, but the material I'm reading (and another sources) are not clear.

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Cisco Switching/Routing :: Default Routes In Nexus 5k

Apr 29, 2013

I have a pair of N5K's, down stream from them are from Fabric Interconnects and a UCS chassis.  Upstream is a stack of 3750's then ASA5510's. 
 
I am trying to backup the config to our TFTP server and I am getting 'no route to host'.. I tried to add a route, and found that N5K uses VRF's for routing?? .. After some looking I see there are two base VRF's 'management' and 'default'.. the management VRF has a default gateway entry and a single interface member (mgmt0).. when I look at the default VRF .. there are no interface members or routing entries.. Ok, I can handle that just add some interfaces and add a default gateway.  Then I get lost:
 
I'm able to access the UCS manager..... so how the heck is that even possible if there's no gateway defined anywhere (or maybe I'm missing something?).  My theory was: add all other ports but mgmt0 to the default VRF, and have the default gateway point out of the uplinks (a vPC).. but wasn't sure how that would affect anything and mainly just wanted to know how I was able to access the UCS manager in light of the fact that there is no default gateway anywhere that I could see...

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Cisco Switching/Routing :: Track IP Routes On 6509?

Jul 2, 2012

We have a need to track specifc subnets on our two 6509s, running IOS version 12.2(18)SXF16. Basically, we want to do this:
 
track 1 192.168.0.0 255.255.255.252 reachability
track 2 192.168.1.0 255.255.255.252 reachability
 
However, the 6509 IOS only provides the option to track an interface. Is this a feature that's available in later IOS versions?
 
Is there another way to track these routes? The subnets are used for WAN links at a HQ and DR site and we are doing a specific PBR (sending all http/https traffic) using these subnets. If that WAN link goes down, we want to be able to utilize a backup WAN link to support that traffic.

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Cisco Switching/Routing :: 871 IP Routes Based On Domains

Apr 9, 2012

I would like to configure few routings on my Cisco router 871 in order to allow my employees to have access only to specific websites.However, since some websites have dynamic IPs propably the route that I will create will not work.
 
My question is, can I configure a route or is there any other way to configure this permission based on the hostname/domain? For example, if I want to permit access to this website www.surveymonkey.com (75.98.93.51) instead of configuring:
 
ip route 75.98.93.51 255.255.255.255 192.168.10.250
 
is there any way to configure based on the url.. in order to be able to recognise this host correctly??

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Cisco Switching/Routing :: Dynamic Routes With 1711

Jan 23, 2012

Im new to cisco routes, Im traing to configure a 1711 routes with a dsl 2wire routes, my problem is that Im able to ping anywhere in the routes, but when Im on my computer I can only ping the interfaces on the router but no the 2wire route that gives me access to the internet.
 
                                                              Cisco 1711                                                                       2wire                                                        
                          f0 192.168.200.1(Inside NAT)          e0 192.168.1.76( 2wire Nat)              192.168.1.254      (Internet)
 
My computer is getting ip addres 192.168.200.100 when I ping th 192.168.1.76 is fine, but when I try to ping the 192.168.1.254 does not work, Im assuming the cisco has activated a dinamic route from .76 to .254, but it is not working, why?

Here is the router configuration
 
Router#show runBuilding configuration...
Current configuration : 1183 bytes!version 12.3service timestamps debug datetime msecservice timestamps log datetime msecno service password-encryption!hostname Router!boot-start-markerboot-end-marker!!no aaa new-model!resource policy!memory-size iomem 25ip subnet-zero!!no ip dhcp [Code]....

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Cisco Switching/Routing :: 6500 Two Default Routes Not Working

Oct 15, 2012

6500 - version (s72033_rp-ENTSERVICESK9_WAN-M), Version 12.2(18)SXF17a.I have two ISP's. I have created two defaults as follow & secondary route does not work. [code] After disabling the interface to ISP1, backup routes does not work. [code]

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Cisco Switching / Routing :: 6500 / VSS - Share / Leak Routes Between VRF And GRT

Dec 13, 2012

I have a scenario which is fairly common - certain servers are accessed from the internet via a Load Balancer, and since seeing true client IP is a requirement, the return traffic path must go back through the load balancer.  However, I do not want to route all traffic via the load balancer for obvious performance reasons.  Internal traffic should be routed directly by the Layer 3 switch, which has a default route of a Firewall. 
 
My plan is to use a VRF for the load balancer and any applicable servers, which works fine.  But now I need to join the VRF's routing table with the switch's GRT (global routing table) so that internal traffic works.  What is the best way to do this?  For scalability reasons I'd like to avoid static routes and I see many examples  using BGP, but in this case it seems overkill since everything is on a single logical switch.  Can I use OSPF instead?  Or a different method?  The Supervisors will be 2Ts, so IOS 15.0 will likely be running.

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Protocols / Routing :: How To Make Sure R11 Is Able To Get OSPF Routes Of All Areas

Oct 19, 2012

How can I make sure R11 is able to get the OSPF routes of all the areas. Make sure area-278 does not receive any ospf routes from other areas as well as from ASBR routes from other areas. At the same tim, area-278 should be able send successfully RIP routes that we receive from R2 to backbone area.

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Filling In Routing Table

Dec 8, 2012

I have this routing table which I need to fill in for the network shown in the image attached. guide me to some good resources to understand

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Cisco Switching/Routing :: 2800 Series To Set Static Routes Per Vlan

Aug 3, 2012

Is there a way to set static routes per VLAN?Example VLAN 100 sends all traffic to 192.168.1.1 and VLAN 200 sends all traffic to 10.1.1.1. (2800 Series RTR)I have 5 networks that have their own gateway to the Internet via satellite link. Those networks run over the same infrastructure on separate VLANs. They frequently send traffic to each other, which gets sent over a slow SAT link. I introduced a router to the network and would like to set all my hosts default gateway to the local routers sub-interface then have a static route that send all traffic that is not on one of my 5 networks back to that VLANs respective SAT modem to get routed out over the Internet.

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Cisco Switching/Routing :: 3660 - ASA OSPF Filtering Inbound Routes?

Feb 11, 2013

How filter inbound routes in Cisco ASA OSPF? Because Cisco ASA has no "distibute-list" command for OSFP process configuration, I try to use "filter-list" command in area definition. So, I try to use next configuration:
 
R1 (Cisco 3660):
 
skip 
!
router ospf 1

[Code].....

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Cisco Switching/Routing :: 2800 - Router Will Only Forward With Host Routes

Jan 1, 2013

we have a 2800 series router functioning as our internet router and it will only forward packets to addresses with host entries in the routing table even if the network is directly connected.

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Cisco Switching/Routing :: 4507 Pb To Propagate Ospf Routes To Another Router On

Nov 15, 2011

On a 4507 v12.2(20)EW, the connected subnets which are declared in the ospf instance are not propagated to the MPLS carrier router.Only the static routes which are redistributed in the ospf instance are propagated to the MPLS carrier router.

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Cisco Switching/Routing :: SG300 Static Routes Are Not Deleted / Editable

May 14, 2013

I have a Routing issue with one of my SG300-28P units. It has several Trunked VLANs. I think I habe Narrowed it down to a Default Route on the offending SG300 though I cannot see to change or delete any of the Static Routes on the unit. I can Add Routes with no issues, but once Added I cannot Edit or delete them. 

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Cisco Switching/Routing :: 2821 - Setting Up Multiple Routes With Failover

Apr 2, 2013

I'm a bit perplexed atm with trying to set up multiple failover routes on a 2821 router.  Let me say that I have more experieince in a switched network as routing is seldom required where I work atm.  Here's my problem. I have a routing table set up as follows but only the primary routes work.  The failover routes will not kick in once the primary route is not there.
 
ip route 10.32.11.0 255.255.255.0 128.32.8.11
ip route 10.32.11.0 255.255.255.0 128.32.24.11 100    
ip route 10.32.12.0 255.255.255.0 128.32.8.12
ip route 10.32.12.0 255.255.255.0 128.32.24.12 100
ip route 10.32.14.0 255.255.255.0 128.32.8.14
ip route 10.32.14.0 255.255.255.0 128.32.24.14 100
 
Ip addresses are not exact but it gets the point across.
 
Why the failover routes are not failing over?  The failover routes work if I remove the primary route from the config.

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Cisco WAN :: 2811 - Static Routes Need Some Input Policy Based Routing

Aug 13, 2011

I have 2 connections a single T1 for voip traffic only and a DSL line for data traffic.the dsl was migrated to a 2811 with out any issues now comes the time to move the T1 over.
 
on the T1 side I am able to ping the WAN router and the LAN router IP address but nothing behind it.

currently this is the only statment on the router:
ip route 0.0.0.0 0.0.0.0 Dialer1
 
as a quick a dirty to remove the above i tried:
no ip route 0.0.0.0 0.0.0.0 Dialer1
ip route 66.55.110.0 255.255.255.0 Dialer1
 
but the DSL side dropped. we have a 66.55.110.152/29
 
for the T1 i would use the following statement.. we have a 209.98.53.192/27
 
ip route 209.98.53.0 255.255.255.255 65.32.70.177

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Cisco Switching/Routing :: 6500 OSPF External Routes Churn

Oct 7, 2012

I am observing some strange behaviour related to the routing table, almost all external routes and some inter-area routes are getting refreshed every 10 seconds.
 
I am getting more than 1000 entries after running 'sh ip route | i 00:00:0', these external routes are being advertised by a neighbor 6500 which redistributing these static routes.
 
Platform is 6500 with SUP-720

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Cisco WAN :: 7200 Series NPE-G2 BGP Routing Table?

Jul 2, 2012

What are the rough figures that a NPE-G2 is able to hold for the BGP routing table?
 
378475 network entries using 51472600 bytes of memory 378482 path entries using 21194992 bytes of memory 63008/63003 BGP path/bestpath attribute entries using 8065024 bytes of memory BGP using 82975730 total bytes of memory
 
Are these 3 memories different memory allocated or are they are a sub-set of each other? If a NPE-G2 has 1GB RAM, does it mean that the routing table limit is depending on the RAM availability?

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Cisco WAN :: Routing Table Size In 800 Series

May 26, 2013

What is the size of the routing table in the 800 series?

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