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- About allenelson
08-18-2017
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Member since
10-23-2006
118
Posts
4
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0
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04-09-2014
08:25 AM
Gotcha gotcha, duly noted. The community statements had me questioning the validity.. ip community-list X permit Since I don't plan on adding them for the unknown communities. This is great info though, once again many thanks, sometimes I get stuck thinking inside the box.
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04-09-2014
07:34 AM
Apologies I wrote the local preference backwards.. Confused lower taking precedence over the higher. That's exactly what I'm after though. Will the route-map permit 50 allow the rest of the communities in.. I think you've answered that for me and that's the answer I was hoping for. I wasn't sure because I was permitting the 4 communities but not specifying the unknowns. My hopes were the permit statement in the route-map would take care of that for me. I'll post the results after I can schedule downtime and test. I thank you both for the help, I wasn't thinking out of the box on this one stuck on single communities at each location.
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04-08-2014
08:23 AM
This is my thought now.. I'm reiterating what was said in #1 about setting up multiple communities. I'm hoping on sites C & D I don't have to block anything which should allow the provider routes to come through. As an example, this is one of the provider routes and the community value that is set. Gateway#show ip bgp 63.139.151.69 BGP routing table entry for 63.139.151.69/32, version 16 Paths: (1 available, best #1, table default) Not advertised to any peer 15270 65007, (received & used) 74.9.113.185 from 74.9.113.185 (64.80.254.206) Origin IGP, localpref 100, valid, external, best Community: 65007:10129 So I'm looking at 65007:10129.. But I'm hoping it doesn't matter because I'll add a last resort permit statement in the route-map that allows all communities through. I'll post a sample for site C below, let me know if you think this would work. This is based on the fact I'll be receiving 4 communities, 7000:20 7001:20 6000:20 and 6001:20 plus unknowns. The communities I'd like to weigh are 7001:20 and 6001:20 which contain the 172.16.x.x routes. 7000:20 and 6000:20 will have the local LANs and should be the same weight throughout locations. The last permit statement in the route-map should allow the carrier to pass whatever community it sends without blocking it. router bgp 65000 neighbor x.x.x.x route-map INBOUND in ! ip bgp-community new-format ! ip community-list 1 permit 7000:20 ip community-list 2 permit 7001:20 ip community-list 3 permit 6000:20 ip community-list 4 permit 6001:20 ! route-map INBOUND permit 10 match community 1 set local-preference 120 route-map INBOUND permit 20 match community 2 set local-preference 120 route-map INBOUND permit 30 match community 3 set local-preference 120 route-map INBOUND permit 40 match community 4 set local-preference 130 route-map INBOUND permit 50 !
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04-08-2014
08:05 AM
To add onto this, I have no control over the provider equipment, whatever they send me I'm at the mercy of. This is what was strange to me.. Without blocking anything, just setting up communities, when I advertise 172.16.29.0/24 from site A and B, I look on site C using show commands and can only see the route it actually preferred. Couldn't find an alternate path in the backup table at all. Is this normal behavior? Part of the issue is that I'm peering with the provider equipment. None of the neighbors are customer owned equipment which is why I'm trying to tag the routes as they come through so I can then influence which one to prefer somehow. But like I was saying, whichever route is installed into the table, that's it, no backup is found. Is there an alternate in the provider router? More than likely but I can't see it and I think that's why I can't influence it. Metrics considered, both routes should be equal cost in my eyes, but how many routers downstream on the provider side is unknown, so they may not be equal cost in reality.
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04-08-2014
07:59 AM
1. I am setting the communities and am receiving them on the far end. I like where you went with this, something I hadn't thought of. If there are 3 routes advertised by A & B, maybe I should set them to different communities and the routes that aren't duplicates set them as another? So in that case at each site I'd have 2 distribute lists, with 2 different communities. Community 7000:20 could advertise the 3 172.x.x.x's while community 7001:20 could advertise it's local LAN 192.168.5.0? I could then replicate this at site B with community 6000:20 and 6001:20 ? 2. That's the issue, I don't want to block any communities yet I want to prefer which community to inject into the forwarding table. That's basically why I'm asking for assistance, maybe communities aren't the attribute I'd like to use in this equation? 3. The provider routers are passing the community tag, I've verified this. But on the provider equipment I think it's just using it's AS number as the community field as well.
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04-08-2014
07:54 AM
If I allow 1 community in I lose a few things. The first is all of the MPLS routes that are provided by the carrier's equipment. I'd basically block routes to their routers and wouldn't be able to access the community allowed in the ACL due to that. The next problem is, I'd also lose the LAN network route from community X which I need because lets say it's the main branch. The main branch advertises 3 duplicate network routes, but also it's own local subnet.
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04-07-2014
01:44 PM
Hello I'm trying to come up with a good way to prefer inbound BGP routes on a provider MPLS network. My initial thoughts were setting up and using communities, but unfortunately this lead to some headache and wasted time. I'm looking for a simple way to advertise the same networks from routers A & B but select which ones to prefer at C & D. This is going to be used for redundancy and load balancing bandwidth intensive applications that have their own circuits back to the vendor networks installed at A & B. Changing the metrics doesn't seem feasible because all sites will prefer the same path. In a nutshell, is there an easy way to filter a specific community similar to using "ip as-path access-lists" ? I'll post my configs below but these were not working. When trying to verify the correct routes were installed and saved, the backup route wasn't showing up at all in the backup table, so my thoughts are the provider routers are blocking the route completely for whatever reason. Another issue with this setup is the community tag set on the provider routers. I can't tell what is set, but if I block and allow specific communities it appears to block the downstream routers community tag as well, rendering all of the MPLS routes invalid and killing the connections. The AS's in use are 65000 and 15270 but I've also seen 65007 via show ip bgp. My guess is that's another AS in the middle of the provider network somewhere. rtr-A# ip bgp-community new-format router bgp 65000 bgp log-neighbor-changes network 192.168.5.0 mask 255.255.255.0 neighbor 1.1.1.185 remote-as 15270 neighbor 1.1.1.185 update-source MFR1.502 neighbor 1.1.1.185 send-community neighbor 1.1.1.185 soft-reconfiguration inbound neighbor 1.1.1.185 route-map SITEA out ! route-map SITEA permit 10 match ip address prefix-list OUTBOUND set community 7000:20 ! ip prefix-list OUTBOUND seq 5 permit 172.16.26.0/24 ip prefix-list OUTBOUND seq 10 permit 172.16.29.0/24 ip prefix-list OUTBOUND seq 15 permit 172.16.33.0/24 ip prefix-list OUTBOUND seq 20 permit 192.168.5.0/24 rtr-B# ip bgp-community new-format router bgp 65000 bgp log-neighbor-changes network 192.168.240.0 mask 255.255.255.0 neighbor 1.1.1.205 remote-as 15270 neighbor 1.1.1.205 update-source Serial0/0/0.502 neighbor 1.1.1.205 send-community neighbor 1.1.1.205 soft-reconfiguration inbound neighbor 1.1.1.205 route-map SITEB out ! route-map SITEB permit 10 match ip address prefix-list OUTBOUND set community 6000:20 ! ip prefix-list OUTBOUND seq 5 permit 172.16.26.0/24 ip prefix-list OUTBOUND seq 10 permit 172.16.29.0/24 ip prefix-list OUTBOUND seq 15 permit 172.16.33.0/24 ip prefix-list OUTBOUND seq 20 permit 192.168.240.0/24
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Labels:
Created by
allenelson
in IP Telephony and Phones
in IP Telephony and Phones
08-13-2012
11:33 AM
08-13-2012
11:33 AM
Found the issue, related to a new feature called toll fraud prevention. http://www.cisco.com/en/US/tech/tk652/tk90/technologies_tech_note09186a0080b3e123.shtml
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Created by
allenelson
in IP Telephony and Phones
in IP Telephony and Phones
08-13-2012
10:57 AM
08-13-2012
10:57 AM
The PRI is configured and working properly, the trunk-group command is not available in controller configuration mode. Lets forget about the trunk group.. I'm going to remove it from the config and point the dial peers back to the port. The issue is, when a call is made it is matching the dial peer but the call is not being setup on the ISDN port. Doing a debug, nothing displays on the screen but you can clearly see the voip dial-peer in the previous match. Edit: IOS voice reference shows controller trunk-group for CAS connections.
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Created by
allenelson
in IP Telephony and Phones
in IP Telephony and Phones
08-13-2012
10:37 AM
08-13-2012
10:37 AM
The command is not available in controller configuration. Is there a variation of it?
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Created by
allenelson
in Wireless Security and Network Management
in Wireless Security and Network Management
08-07-2012
11:57 AM
08-07-2012
11:57 AM
Thank you very much fellas, that worked perfectly.
... View more
Created by
allenelson
in IP Telephony and Phones
in IP Telephony and Phones
08-07-2012
11:45 AM
08-07-2012
11:45 AM
Originally it was set to isdn incoming-voice voice. I was browsing through a PBX interoperability guide which outlined using modem, which is why it is changed. Same scenario with the isdn voice command.
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Created by
allenelson
in IP Telephony and Phones
in IP Telephony and Phones
08-07-2012
10:53 AM
08-07-2012
10:53 AM
Hopefully I can ask this question without being confusing. I've got a branch site where we just installed a CME. The CME has it's own dialtone and everything is working as planned. At their main location, we dropped in a voice 2901 to do h323 over the IP WAN and interface with their Siemens PBX through a PRI. To add onto the mess, I have a lot of translation rules because they wanted access codes for the dialing. Ive setup all of my dialpeers and rules, and can dial from the main site to the branch, but not vice versa. I've run debugs and have verified the correct calling/called party is showing up when the branch dials the main and also the correct outbound dial peer is being matched. Even though this is happening, when debugging the isdn interface nothing shows up, which leads me to believe the d channel is never signaling. This is mainly my question. The h323 gateway is setup as the network side for isdn. Do I need a special command to be able to send digits out of it? It will receive them, but not send. Attached is the h323 gw config for the main location which has the matched outbound dial peer but is not dialing. Thank you in advance!
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Labels:
Created by
allenelson
in IP Telephony and Phones
in IP Telephony and Phones
07-23-2012
08:21 AM
07-23-2012
08:21 AM
Is a handoff number required to use the mid-call features for mobile connect? Personally, I don't believe it is, but I have a system setup which is ignoring the DTMF after enabling the feature in services. Mobile Connect is working.
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Labels:
Created by
allenelson
in Wireless Security and Network Management
in Wireless Security and Network Management
07-05-2012
10:02 AM
07-05-2012
10:02 AM
Is there a way to stop the broadcasting of certain SSID's on certain access points? The customer has a WLC deployed at their main location, with a few APs hanging off of it at a remote. It would be nice if the remote location only broadcasted the networks it can support locally. Thanks!
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04-09-2014
Gotcha gotcha, duly noted. The community statements had me questioning
the validity.. ip community-l...
04-09-2014
Apologies I wrote the local preference backwards.. Confused lower taking
precedence over the higher....
04-08-2014
This is my thought now.. I'm reiterating what was said in #1 about
setting up multiple communities. ...
04-08-2014
To add onto this, I have no control over the provider equipment,
whatever they send me I'm at the me...
04-08-2014
1. I am setting the communities and am receiving them on the far end. I
like where you went with thi...
04-08-2014
If I allow 1 community in I lose a few things. The first is all of the
MPLS routes that are provided...
04-07-2014
HelloI'm trying to come up with a good way to prefer inbound BGP routes
on a provider MPLS network. ...
Created by
allenelson
in IP Telephony and Phones
08-13-2012
08-13-2012
Found the issue, related to a new feature called toll fraud
prevention.http://www.cisco.com/en/US/te...
Created by
allenelson
in IP Telephony and Phones
08-13-2012
08-13-2012
The PRI is configured and working properly, the trunk-group command is
not available in controller c...
Created by
allenelson
in IP Telephony and Phones
08-13-2012
08-13-2012
The command is not available in controller configuration. Is there a
variation of it?
Created by
allenelson
in Wireless Security and Network Management
08-07-2012
08-07-2012
Thank you very much fellas, that worked perfectly.
Created by
allenelson
in IP Telephony and Phones
08-07-2012
08-07-2012
Originally it was set to isdn incoming-voice voice. I was browsing
through a PBX interoperability gu...
Created by
allenelson
in IP Telephony and Phones
08-07-2012
08-07-2012
Hopefully I can ask this question without being confusing.I've got a
branch site where we just insta...
07-23-2012
Is a handoff number required to use the mid-call features for mobile
connect? Personally, I don't be...
Created by
allenelson
in Wireless Security and Network Management
07-05-2012
07-05-2012
Is there a way to stop the broadcasting of certain SSID's on certain
access points? The customer has...
Public Statistics
| Date Registered | 10-23-2006 08:19 PM |
| Date Last Visited | 08-18-2017 04:00 AM |
| Total Messages Posted | 118 |
| Total Helpful Votes Received | 4 |
Helpful Votes Given To
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