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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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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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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Feb 13, 2013
I have a 3560 with IP base that is acting as a true EIGRP stub router today. It advertises local routes to the upstream service provider router and receives a default route.
Now I want to connect a 3900 ISR as a voice gateway. The 3560 does not seem to be advertising any routes to the 3900. Ok the EIGRP stub doc says this:
Only specified routes are propagated from the remote (stub) router. The router responds to queries for summaries, connected routes, redistributed static routes, external routes, and internal routes with the message "inaccessible." A router that is configured as a stub will send a special peer information packet to all neighboring routers to report its status as a stub router.
# Any neighbor that receives a packet informing it of the stub status will not query the stub router for any routes, and a router that has a stub peer will not query that peer. The stub router will depend on the distribution router to send the proper updates to all peers.
I guess I don't understand why the stub advertises local routes to the upstream ISP router but does not seem to advertise routes to the 3900. Does the stub identify the ISP router as the distribution router somehow, thus differentiating it from the 3900? If so, how is this done?
show ip eigrp neighbor detail on the 3900:
EIGRP-IPv4 Neighbors for AS(100)
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
[Code].....
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Mar 5, 2013
We have a 6509 series of core switches and 3750 series of L2 switches, There is no default gateway or any static routes to any IP.VLAN 1 is made admin down and another vlan is used for all communication here in this environment
Attached is configuration for reference But still I am able to take telnet or SSH. I want to know how telnet or SSH or tacacs authentication happens without any static or default route.
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Jun 26, 2012
when will be the command "default interface x/x" on the Nexus 5000 platform available? Even with latest software version (5.1.3.N2.1a) it is not possible. For Nexus7000 it's working fine with 5.2 train.Is there a feature request for it? If not here it is!!It's horrible to deconfigure many interfaces especially in N5k environments with many FEXes.
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Feb 17, 2012
What is the purpose of these default configuration lines? What do they mean? I can't find an explanation of them anywhere. I believe some are written to the config when FCoE is enabled..
I would like to know exactly what they are doing.
class-map type qos class-fcoe
class-map type queuing class-fcoe
match qos-group 1
[Code].....
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Jan 25, 2012
How to remove the config from an ethernet port on a Nexus 5548 - send it back to factory default.
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Sep 24, 2012
Ok I didn't setup my OSPF on my 7010. Today I found out that any static route I put into my 7010 gets sent into to my MPLS network. My 6509's you have to "Tag" the static rout for this to happen. Was under the impression the same was necessary for the 7010 or at least it had to "match" an access list. How can I fix the below so that by default all static routes are not resdistributed into OSPF?
[CODE]...
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Nov 6, 2011
I'm currently working on a plan to migrate our 6500's over to our new 7010's. At the time of the migration I want to tighten up our OSPF design and configure OSPF for "passive-interface default" then allow only those interfaces that should have OSPF neighbors to send the hellos. The issue is that the command is not showing up under the OSPF process. What's even more interesting is that the Nexus 5.x Unicast Routing Configuration Guide shows that the "passive-interface default" command should be an option to enter.
I'm currently running version 5.1(4) (though looking to upgrade to 5.2 during my migration testing). I would rather configure the passive-interface via the routing process versus having to enter it on every interface.
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Jun 23, 2011
We have 2 separate ISP connections with 2 separate routers, during a recent router outage we found that our PIX firewall was not routing to the second default route that I have in the pix configuration. Doing some searches on CCO, I have seen some documents that say that the PIX only supports one default gateway/route. Is this still true, even in version 8 of the PIX software? Is this still true in the newer ASA's? Or will they support multiple default routes?
I'm thinking I'm going to have to setup HSRP on my 7206 Internet routers so the PIX can use one gateway, but wanted to verify before I take the time to set this up.
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Mar 26, 2012
I have a internet router 2921 .my isp is providing 100 mbps internet link with static public ip network .I am using a default static route to the isp wan ip .I am planning to upgrade 100 mbps to 114 mbps .Unfortunately my isp doesnt have gig port in their side .So they are ready to provide two 57 mbps line .Isp agreed they will route my public ip networks in both the links .
As a result i have two 54 mbps link with same network with two wan networks .My question is whether two default static route to both wan ip will carry out the load sharing correctly ?
Eg :
172.24.66.0 255.255.255.252 -first link my fa0/1 172.24.66.1
172.24.66.4 255.255.255.252 -second link my fa0/2 172.24.66.5
ip route 0.0.0.0 0.0.0.0 172.24.66.2
ip route 0.0.0.0 0.0.0.0 172.24.66.6
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Feb 23, 2011
We are facing issue of continous packet discards On nexus4001L link (int po2) to Nexus5020 switch. Nexus4001L is installed in IBM blade center server and we have FCOE enabled in this setup. [code]
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Mar 15, 2013
I have been tasked to replace the existing Cat 6500 and 3750 switches by Nexus 7000 and Nexus 2000.I was told initially my boss plans to get 2 x Nexus 7000 and then eventually blow up to 4 x Nexus 7000s.For Nexus, is there a list of tasks / points that i need to consider for building the initial design?
Can i just link the Nexus 7000 like the following?
N7k-A ========= N7k-B
| |
lots of N2ks lots of N2ks
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Dec 22, 2011
Struggle to find the SNMP MIBS of the Nexus 5000 FEX tranceivers.
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Jan 24, 2011
We have multiple sites that are linked via MPLS (L3) circuits. We have good size circuits for Internet at two main sites (HQ and QC) and smaller sites come to HQ site to go to internet. We are running ospf (Cisco L3 switches) with service provider (ME3400) at these two main sites and service provider then redistributes routes back into MPLS via BGP and then smaller sites ME3400 learn these routes. i am injecting default routes from HQ and QC, but Telco is only redistributing default from HQ. So large pipe Internet at QC is not being used effeciently. Also if MPLS at HQ fails, then we are told, we need to call Telco and they will make change in their network to now start distributing default from QC.it was my understanding that telco can use BGP communities and advertize one default as prefered and second with higher cost, so that failover can occur automatically. And that they can also set up so that west cost sites use HQ and east cost sites can use QC for going to internet, but they say it is not possible.it the least, can I do something like this at my end for failover for internet, in case MPLS at HQ goes down (soon we will be setting up a point to point VPN tunnel between HQ and QC so that MPLS failure at HQ will trigger advertisement of HQ routes over tunnel via QC into MPLS, so other sites can then come to HQ thru QC over this tunnel. At QC Cisco router (to detect loss of default route from HQ and then start advertizing default from QC)
router ospf 1
default-information originate always route-map From_HQ
exit
ip access-list standard From_HQ
[code]....
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Nov 13, 2012
we are planning a Nexus datacenter project with this layout:Our experiences with Nexus switches are not so large until now and the manuals are very extensive.Both N5K´s should be connected directly with all 4 N2K switches. I did not find a layout like this in the manuals. Only a design,where only 2 N2K are connected to one N5K, with this fex config:Now I´m not sure if it is right to make a config like this with the same slots and fex´s or with different slots and fex´s.
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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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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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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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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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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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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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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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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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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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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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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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Mar 26, 2012
Is it possible to issue eigrp leaking routes on catalyst 6500 running IOS 12.2-33SXI9 on gigabitethernet interfaces? or is there another way to acomplish this?
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Nov 1, 2012
I have a WS-C3750G-24T-S layer 3 switch and I need to configure independent routes for a specific network, I'm trying to use VRF but it is not working for me. I tried using route-map but it seems the switch doesn't support that, so I'm stuck with VRF, but I think I'm not doing it right. The topology is as follows:
I have a network directly connected to a vlan and I need to forward all the traffic I get on this VLAN using a tunnel to a router. I think the problem is that in order to use the tunnel I need to utilize another VLAN which isn't part of that VRF. I attach the configuration I'm using to better understand what I'm trying to do:
layer-3 switch:
ip vrf TEST
rd 1:1
interface Tunnel1
ip vrf forwarding TEST
ip address 172.17.0.1 255.255.255.252
tunnel source 10.245.0.9
tunnel destination 10.250.4.31
[Code]....
And this is how my routing table looks on this router:
172.17.0.0/30 is subnetted, 1 subnets
C 172.17.0.0 is directly connected, Tunnel4
C 10.250.4.0/24 is directly connected, Vlan404
S 10.245.0.8/29 [1/0] via 10.250.4.1
S* 0.0.0.0/0 [1/0] via 10.1.60.15
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Mar 17, 2013
If a router receives EIGRP (AD90) routes, and is configured to redistribute thoes routes into BGP(AD20), why does the RIB show only the incoming EIGRP routes and not the redistributed bgp routes? Are redistributed routes considered for RIB entry in the router that is doing the redistribution
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Nov 11, 2011
I was trying to find if it's possible to add the option for static routes for DHCP clients on Cisco IOS DHCP config mode. I'm looking to add a settings as defined on RFC 3442, like this one, set on ISC DHCPd server:
Global settings:
option rfc3442-classless-static-routes code 121 = array of integer 8;
option ms-classless-static-routes code 249 = array of integer 8;
And for the subnet declaration:
option rfc3442-classless-static-routes 24, 192, 168, 30, 192, 168, 10, 1;
option ms-classless-static-routes 24, 192, 168, 30, 92, 168, 10, 1;
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Jun 10, 2013
Is there any way to have my Cisco 877W Router alter from using one static route to another static route when another router on the network is reporting destination host unreachable?
Router 1 (192.168.2.253)
Dialer0 -> ppoe to internet
Vlan1 -> local 192.168.2.0/24
Router 2 (192.168.2.254)
Dialer0 -> ppoe to managed VPN (172.16.28.1)
Vlan1 -> local 192.168.2.0/24
Router 2 is connected to another network through a managed VPN and that network also has internet access. I want to be able to have two routes to the internet on Router 2. And when Router 1 internet goes down packets get routed through the VPN instead.
I currently have on Router 2
ip route 0.0.0.0 0.0.0.0 192.168.2.253
ip route 10.0.0.0 255.255.255.0 Dialer0
ip route 0.0.0.0 0.0.0.0 172.16.28.5 250
Which does nothing when Router 1 has its Dialer0 interface shutdown, or goes offline completely.I suspect I could reverse the setup and have everything routed through the VPN by default and then if / when Dialer0 interface goes down it would switch to using Router 2, but if the problem is in the remote network and interface Dialer0 stays up, it would probably do the same thing... nothing.All devices mentioned are Cisco 877W routers with ADSL and a bunch of fast ethernet interfaces.
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