Cisco :: Redistribution Of BGP Into An IGP?
May 1, 2012
Is it deemed bad practice to redistribute BGP into an IGP such as OSPF or EIGRP? BGP will only be private routes and not an internet routing table. The reason I have for wanting to redist. into an IGP is so a L3 switch (the default gateway for hosts) can route to different upstream routers (where the redistribution would happen). I do not wish traffic to hit one router (via a default route to HSRP or similar) to then be routed across to the other router via an iBGP, for example-I feel I would like traffic to be predictable. Secondly, I'm quite sure that the first router would have difficulty routing internally via the same AS number as BGP prefers external AS's.
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May 7, 2012
With the network command you can inject routes from the routing table into the BGP process.Why the need to redistribute routes from another routing protocol into BGP using redistribution if you can do the job with the network command?
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Mar 27, 2013
We are currently running ISIS and recently we have purchased 2 WS-C3750X-24. Unfortunately 3750 do not support ISIS and we have decide to use redistribution between ISIS and OSPF. We are using Stack feature so consider 3750 as one chassis.
Router A and Router B are ISIS neighbors. As first step we have setup redistribution between Router A and Switch 3750
Router A Configuration router isis
net 49.0000.0000.0000.0001.00
metric-style wide
[ code]...
Switch 3750 Configuration
router ospf 1
router-id 192.168.2.1
passive-interface Vlan3
[ code]...
From Router's A routing table we see the ospf routes life is good Switch routing table has E2 - OSPF external type 2 routes and is reachable from the rest of the network.
Router A #show ip route ospf 1 Gateway of last resort is not set O192.168.10.64/27 [110/2] via 172.17.1.3, 2d01h, GigabitEthernet1/20 [110/2] via 172.17.1.1, 2d00h, GigabitEthernet1/19
When we bring up the ospf adjacency with Router B the whole ISIS routes are replaced with E2 - OSPF external type 2 which is not desirable.
Router B Configuration
router isis
net 49.0000.0000.0002.00
[ code]...
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Jan 9, 2012
I am facing two issues in BGP both the topology and Config files.Because the link between Vail and Telluride runs iBGP, both routers will learn about the networks in AS 300 and AS 400 through native BGP only and both AS's do reach each other. Both routers are also running OSPF with Aspen and BGP routes are redistributed into OSPF domain. Now, Aspen knows about the networks in AS 300 and AS 400. Now suppose the link between Vail and Telluride fails, both AS 300 and AS 400 can't reach each other anymore. The only solution to this is to redistribute OSPF routes to BGP on Vail and Telluride. But when i did this, only routes with "O" learned by Tahoe and Alta. In other words, Tahoe sees only 192.168.1.220, 192.168.1.196 and Alta sees only the same routes. Why the redistribution from OSPF to BGP didn't advertise the O E2 routes?
This actually was discussed before but i still can't get it. It is not an actual issue.It is about "Syncronization". I know that we've said many times to turn on Sync. when we do redistribution from BGP to an IGP to make sure that the routes are installed correctly in the IGP routing table. However, as you notice in the configuration, i didn't enable Sync. on Vail and Telluride for a long time and redistribution still works fine.
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Dec 20, 2010
I redistribute our MPLS eBGP routes into our internal EIGRP process at each site. This action undesirably redistributes locally generated BGP networks (via network command) that are meant from the MPLS cloud into our internal routing process.I currently have a route-map on my 'redistribute bgp' command that filters each network manually with an ACL. This works but adds obvious administrative overhead; each WAN router advertises different networks, and the ACL must be updated for each new network.Would it make more sense to simply deny routes from BGP to EIGRP with a metric of 32768? Something like this,route-map deny-local-bgp deny 10 match metric 3276 router -map deny-local-bgp permit 20,router eigrp 100 redistribute bgp 65104 route-map deny-local-bgp.
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Sep 20, 2011
I have two 7604 routers running IOS 12.2(33)SRB5a as ASBRs in my network. They both connect to a common AS via DS3 lines.FR01 is considered my main circuit, FR02 is the backup. But I have some heavy disk sync traffic I want to route via the backup unless that circuit is down.How could a static redistribution possibly influence all my routes ?
Here is the remote AS config on both routers. We summarize the routes and only change the redistribute metric to distinguish main from backup circuit :
[code]...
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Jul 27, 2012
I am having a problem reaching a soho linksys e1000 router through a second hop cisco 2900 router.Here is a brief topology of the network: I am using OSPF area 100 for all networks except for
192.168.2.0 on R1 to E1000 which is RIPv2
R1 directly connects to R2 with a point-to-point serial on network 192.168.12.0 /30 with ip 192.168.1.13
R1 directly connects to a a switchport using network 192.168.2.0 /24 with ip 192.168.1.75
R3 directly connects to a switchport using network 192.168.1.128.0 /25 with ip 192.168.1.129
R3 directly connects to a different cisco router using ethernet on network 192.168.1.0 with ip 192.168.1.1
E1000 directly connects to a switchport using network 192.168.2.0 /24 with ip 192.168.2.1
The switch has a vlan ip on 192.168.1.128 /25?I can ping from R1 to E1000?I can ping from R3 to R1 192.168.2.75? I can't ping from R3 to E1000 192.168.2.1?show ip route on R2 indicates that network 192.168.2.0 is reachable via the serial connection on 192.168.1.12?I have redistributed rip to ospf area 100 and OSPF to RIP on R1?I am wondering why R1 can reach E1000 on network 192.168.2.0, and why R3 can reach R1s 192.168.2.0 newtork, but R3 can't reach the E1000.There is an R2 router than can reach R1 and also cannot reach E1000, but I assume it's for the same reasons R3 can't, so I've omitted the remainder of that topology for this question.
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Feb 15, 2012
I'm looking to redistribute static routes in to OSPF on a Nexus 7k. To do this I'll be using a route-map with a match statement. My question is can you match routes using an ACL, a prefic-list or both. The reason that I ask is that in some docs I've read it states the following:
IP access lists—(For policy-based routing only). Match based on source or destination IP address, protocol, or QoS parameters. This tends to indicate that you can't use IP access lists for the match criteria for redistribution.
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Sep 6, 2012
Is there a known bug for Nexus 7K version 6.0(4) related to route redistribution?I have few vlan interfaces and being redistributed to the BGP.vlan interfaces are all up ang pingable.After configuring redistribution, vlan route is not in the bgp table.sho ip bgp is saying "path invalid"
BGP routing table entry for 10.165.101.192/28, version 26302
Paths: (3 available, best #3)
Flags: (0x180c0021) on new-list, is not in urib, need resync with RIB, exported, has label
vpn: version 47719, (0x100002) on xmit-list
local label: 492294
[code]....
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Feb 7, 2013
I have two ospf processes running on a single 3570 edge router that has a dedicated transport circuit back to our network core. We are adding an additional "transport" only circuit into a new location that is also apart of the second ospf process backbone which will connect back to our core. There will also be a 3750 for this new circuit termination. Currently we are only redistributing ospf process 2 into ospf process 1 (1 = core backbone).
#router ospf 1
#redistribute ospf 2 subnet
We have no need to have ospf process 1 redistributed into the process 2 tables. That being said, when we add an additional transport ciruit, or path back to our core backbone, will this configuration present any issues with the redistribution process and failover.
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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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Sep 22, 2011
I have 2 ASBR routers, AGFR01RTR03 and AGFR02RTR03, performing OSPF to OSPF redistribution in both ways for the same ***. They also do summarization for our private addressing scheme. It is all working just fine for that part (neighbors, summarization, redistribution).
AGDC01RTR01 --- AGDC02RTR01 (OSPF 1000 ABRs)
| |
| |
AGFR01RTR03 --- AGFR02RTR03 (OSPF 1000 / 53 ASBRs)
Let's focus on AGDC01RTR01 with a specific entry here (IP subnet is fake) :
Routing entry for 1.1.1.0/25
Known via "ospf 1000", distance 110, metric 300, type inter area
Last update from 10.2.244.76 on GigabitEthernet5/1, 1d03h ago
Routing Descriptor Blocks:
* 10.2.244.76, from 10.2.1.249, 1d03h ago, via GigabitEthernet5/1
Route metric is 300, traffic share count is 1
[code]...
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Aug 18, 2011
we are looking at adding our ASA's to our EIGRP autonomus system. .is it possible to redistribute "routes" which are accessible only from a site to site VPN? I put "routes" in quote marks because the remote networks do not appear in the routing table.BTW the firewalls are running ASA 8.4(2)
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Jul 20, 2011
I'm trying to test fast roaming using a Cisco 2100 Series controller and 2 1140 APs. The initial authentication succeeds fine and the wireless connection works ok using WPA2+CCKM and LEAP with a Cisco ACS radius server.The problem is that the client does not attempt to preauthenticate with the other AP because the RSN Capabilities IE in the AP beacons and probe responses do not set the RSN Preauthentication capable bit. I can't figure out what it takes to get the APs to indicate to clients that it can do preauthentication. I'm been crawling through all the documentation I can find, to no avail.
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Aug 22, 2011
We are about to share a 10 MBit ISP connection with 2 others companies, and they are going to split the bill up into 3,3 and 4 Mbit, so we where thinking that we could setup a switch before their and ours router and provide them with a static IP from our ISP. But is it possible to set a bandwidth limit on the ports of a Cisco Catalyst 2960-8TC, so that we can set a limit of 3,3 and 4 on 3 ports.
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Dec 3, 2011
I want to PAT my project of WLAN and i attached the document, how I create the Testing Criteria of the said scenarios, PAT document includes WCS 7.0, WLC 5508, MSE 3310, Cisco AP 3502e and ACS 4.2.
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Jul 12, 2012
I have cisco ASA5510 firewall using in my network but unable to bolck Url's unwanted. can i block the [URL] on the asa by using regular exp.
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Mar 1, 2012
I have 7 POE switches that have ESI IP phones attached. I have two VLANS, 1 and 2. VLAN 2 is used for voice and is defined in each switch.The ESI IP phones connect to my POE switch ports and the pc attaches through the ESI IP phone.
I have had voice quality issue between floors in my building. Talking to others on my floor via the IP phone, there are no voice quality issues. [code]
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Nov 18, 2012
is it possible to connect Cisco Ap-1242AG with non-cisco wireless router to work as repeater?
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May 1, 2012
I am looking at a config on a 5550 FW, and am trying to make sense of the syntax of the following rules. I have been to the Cisco site, but can't find much on the syntax.
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Mar 10, 2011
I currently use a device called the Access Enforcer which runs OpenBSD. I have 3 stable, working VPN tunnel's where the other side's device is a Cisco ASA 5520 or 5540. I was setting up my 4th VPN where the other side used a Cisco ASA 5520 and ran into issue's. The Cisco side can bring up the tunnel. Once the tunnel is up each side can talk to the other side. However, when the tunnel is dropped, the OpenBSD side cannot bring up the tunnel. The error received is on the OpenBSD device is "isakmpd[29581]: transport_send_messages: giving up on exchange from-XX.X.X.0/24-to-XX.XXX.XXX.240, no response from peer XX.XX.XXX.141:4500". I have been trying to figure this out for weeks now and can't seem to find the cause.
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Dec 5, 2011
I am trying to configure a 3750G that has been sitting on the shelf for several months and am getting the following error -
% Error: Unable to create flash:/microcode_update% Error: It must not already exist
Normally, getting an error during POST isnt a good thing. My first thought was that flash was corrupted or flagged RO somehow. I did fsck flash: with no change. I next tried fsck /test flash:. It tested 77 blocks and performed 0 erasures. It had been running for about 15 minutes with no problems reported so far. Multiple reboots of the switch still report the same error.
I have reviewed the history of what I have done on this switch and finally think I found the problem. I noticed a microcode_update directory that I am not used to see on a 3750. Deleted the directory using the rmdir command and rebooted the switch. On reboot, I noticed that a front_end/ directory was listed as being created as well as fe_type_1 and fe_type_2 were created. The switch now boots up without any errors.
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Jan 3, 2013
I have two Cisco Aironets 1401 connected to a Cisco Catalyst 3560 Switch. When users log onto the Wifi the APs authenticate with a Freeradius that then authenticates with LDAP.
Recently users have been getting kicked off of the network but I'm not sure why.If so how do I set these APs to roam with my setupd?For all I know there could be an issue with the switch I'm just not sure where to start when it comes to troubleshooting this issue.
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Dec 29, 2012
Guys I am using a cisco 2911 router with three interfaces: Gi0/0 connected through a switch to all my servers and Gi0/2 which will connect to another server, and Gi0/1 is my outside interface connecting through a switch to two ISP's.I have webservers and Terminal servers/File Servers with 10.0.0.0 network address connected throught My Gi0/0 interface.Now I want to implement a Cisco Advanced firewall for security on my router using CCP.I want the firewall to work such that it allows external users to access the servers on Gi0/0 through ports 0,23,25,20,21,53, 110,3389. and to access the SIP server on Gi0/2. My issue is can i just create two DMZ's for both interface Gi0/0 and Gi0/2 without creating an inside zone and Gi0/1 as outside zone as my internal traffic is mostly server based and the users connect remotely through terminal server to access resourcess using RDP, secondly how do I open the relevant ports.I have checked alot and all I have seen is just basic process on using the wizard I have no idea how to go about this issue.
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Mar 30, 2011
I bought a new cisco 3550 switch to prepare for my Cisco certification prepration. Actually i dont know how to connect the cisco switch to a laptop with only usb ports....... earlier i used to do my practise using Cisco packet tracer but i think for CCNP switch that is not enough thats y i bought second hand switch. how can i connect that switch with my toshiba laptop which has only USB ports. do i need to buy some sort of convertor or other hardware. And if so what does u call it and how much does it cost?
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Apr 14, 2013
I am struggling to have my PPTP traffic to get routed through NAT to reach other Server LAN segment. I am using Cisco 2921 router as a PPTP server.This Cisco 2921 router is working as PPTP server and doing NAT also to reach Server LAN segment (LAN-B).My problem is after PPTP connection establishes I cannot reach any of the LAN segment, but after connecting PPTP I can browse Internet without any issue, but none of the LAN element is reachable. Please have a look on the configuration I am posting 2921 router configuration to suggest something, I have also attached the network setup for better understanding…Just to update Clients in LAN-A can access Internet as well as servers (LAN-B). [code]
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Dec 8, 2011
I would like to know the IOS which supports :ACL Support for Filtering on TTL Value feature on my Cisco 7600 device. I check on cisco and found the Cisco 12.4T release but this software doesn't fit onto my chasis. which software should I upgrade to on my cisco 7600 to have this feature.
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Feb 27, 2012
I have a cisco router I would like to reset the password for. Its the first password that is entered. for exampleUser access verificationPassword:I have changed the en password using this command:router(config)#enable secret cisco123 <---example password
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Jul 19, 2012
I finally got the Site to Site Vpn from our corporate to remote site. Is there a way to connect a cisco phone over that network. Since both Voice Vlans are exempt from acl I would imagine all traffic is clear to go accross? and if so I just have to set the phone to our tftp/ccme. Will that work.
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Nov 6, 2011
I want to create a user who only has access to "router>" prompt on the CLI. this user should not be able to do enable command and by no other means be able to go to global configuration mode. I know the command router(conf t)# username ABC privilege 1 password ABCPASS, but even with this command, this user gets privilege 15 access.
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Dec 27, 2012
I have the CISCO 1800 and I have there the HWIC-2T. I have two questions.First is an easy one. I want to replace the HWIC-2T with HWIC-4T but the CISCO 1800 guide and the HWIC-4T guide says that they dont fit together but I inserted the HWIC-4T in to the CISCO 1800 it recognized him with all the 4 Smart Serial ports that it hase. The question is, how can I check if the CISCO 1800 supports the HWIC-4T?Second question is how can I configure one of the Smart Serials in the HWIC-2T/4T to comunicate with the X.25 Protocol? What I have now is at one end CISCO 1800 and at the other end CISCO 2800 and they are comunicating with each other throught one of the Smart Serials they have. I want to connect to each one of then an old pc that comunicate only with X.25 and I want this two computers to comunicate with each other throught those two routers.
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Aug 8, 2012
We're currently evaluating Cisco Prime LMS 4.2.Something we've been trying to achieve for the past couple of days is to have LMS notify us when a Microsoft Host is Unreachable, and then to notify us once that alarm has cleared (the Microsoft Host is Reachable again).
We're at the point where the Microsoft Host was discovered, LMS incorrectly identified it as a Cisco Call Manager, so we changed it's identity to non-cisco device > microsoft host > microsoft host. LMS currently has the device listed as being in the 'Questioned' state. SNMP timeout has been set to 15 seconds, and the SNMP community is correct.
Being new to LMS Prime, and having not received any training on the product to this point, we turned to the admin guide, but we couldn't find anything that goes into detail for how to manage the notification for non-Cisco devices.
Is what we're trying to achieve possible with Cisco Prime LMS 4.2? We just want to be able to receive simple 'host unreachable' notifications for Microsoft servers, and the corresponding 'cleared' notifications once the server is back online.
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Feb 13, 2013
I'm trying to understand CEF; I know it's used most commonly in layer 3 switches but that routers can also do it. The routers that support CEF must have special hardware I'm assuming? (Since CEF is layer 3 processes in ASICs) How can we check if a router is capable of CEF? Does anyone know a good link/graphic that shows how much faster CEF is than software-based layer 3 processes?
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