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- About mahesh18
06-19-2019
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Member since
03-05-2005
3794
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97
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3
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06-18-2019
10:00 PM
Hi Everyone, Need to confirm below config is good for Dynamic NAT on 8.2 nat (outside) 1 access-list Security outside access-list Security extended permit ip object-group Outside object-group Test log object-group network Outside network-object host 192.168.144.4 object-group network Test network-object 192.168.134.0 255.255.255.0 What i want is any ip 192.168.144.4 should be translated to 192.168.134.0/24
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05-14-2019
09:09 PM
Hi Everyone, We have 2 ASR Running HSRP between them. We are Running IBGP between the 2 ASR's. We have 3 Prefix which we advertise to the ISP ASR 2 ------------Connects to ISP 2 ASR 1------------Connects to ISP 1 Currently Traffic Flow is From FW to ASR 1 which is Active and it passes the traffic to ASR 2 then to ISP 2 and return traffic is coming via ISP 1. IF i do traceroute from my PC it shows below traffic flow FW--------------ASR1--------ISP 2----------Internet. IF i do traceroute from BGP looking Glass i see Traffic flow to our Prefix via ISP 1 How can I verify that how many prefixes ISP 2 is allowing from our network?
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05-13-2019
02:33 PM
This is config of working Router which has no issues show route-map route-map set-as-prepend, permit, sequence 10 Match clauses: Set clauses: as-path prepend 16569 16569 16569 Policy routing matches: 0 packets, 0 bytes route-map set-local-pre, permit, sequence 10 Match clauses: Set clauses: #show run | in Prefix|prefix neighbor 72.29.230.x prefix-list Corp-Prefix out ip prefix-list Corp-Prefix description Prefixes advertised by Corp ip prefix-list Corp-Prefix seq 10 permit 192.41.x.x.0/24 ip prefix-list Corp-Prefix seq 20 permit 198.160.x.x.0/24 ip prefix-list Incoming-Prefix-Filter description Filter Illegal BGP advertisments ip prefix-list Incoming-Prefix-Filter seq 10 deny 10.0.0.0/8 le 32 ip prefix-list Incoming-Prefix-Filter seq 15 deny 172.16.0.0/12 le 32 ip prefix-list Incoming-Prefix-Filter seq 20 deny 192.168.0.0/16 le 32 ip prefix-list Incoming-Prefix-Filter seq 25 deny 224.0.0.0/4 le 32 ip prefix-list Incoming-Prefix-Filter seq 30 deny 240.0.0.0/4 le 32 ip prefix-list Incoming-Prefix-Filter seq 35 deny 127.0.0.0/8 le 32 ip prefix-list Incoming-Prefix-Filter seq 40 deny 169.254.0.0/16 le 32 ip prefix-list Incoming-Prefix-Filter seq 45 deny 208.98.0.0/16 le 32 ip prefix-list Incoming-Prefix-Filter seq 1025 permit 0.0.0.0/0 le 24 local-preference 150 Policy routing matches: 0 packets, 0 bytes route-map AllowList, permit, sequence 10 Match clauses: ip address (access-lists): 80 Set clauses: Policy routing matches: 0 packets, 0 bytes
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05-13-2019
02:23 PM
Now we have backout our change With current Router show ip bgp injected-paths No output is generated with this command When i try this command show ip bgp filter-list 10 BGP table version is 35779808, local router ID is 72.29.230.x Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, x best-external, a additional-path, c RIB-compressed, Origin codes: i - IGP, e - EGP, ? - incomplete RPKI validation codes: V valid, I invalid, N Not found Network Next Hop Metric LocPrf Weight Path * i 192.41.x.0 192.41.x.x 0 100 0 i *> 192.41.x.x 0 32768 i * i 198.160.x.0 192.41.148.x.x 0 100 0 i *> 0.0.0.0 0 32768 i On NEw router we were missing this config ip as-path access-list 10 permit ^$ ???????????? was this part of the problem? ISP told us during our change we were advertising many more prefixes.
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05-13-2019
11:30 AM
What I see now is with ISP we have this config neighbor 72.29.x.x prefix-list ISP-Prefix out neighbor 72.29..x.x filter-list 10 out I can see we have our Internal NEtwork under prefix list ISP-Prefix ip bgp-community new-format ip as-path access-list 10 permit ^$ ??????????????????????????????????? what does the above commad do? Seems we do not have access-list 10 in our new router? Interface which connects to ISP has int gi1/0/1 ip access-group 110 in access-list 110 deny ip host 0.0.0.0 any log access-list 110 deny ip 127.0.0.0 0.255.255.255 any log access-list 110 deny ip 10.0.0.0 0.255.255.255 any log access-list 110 permit ip 208.98.x.x 0.0.0.3 208.98.x.x 0.0.0.3 access-list 110 deny ip 192.168.0.0 0.0.255.255 any log access-list 110 permit ip 72.29.230.x 0.0.0.3 72.29.230.x 0.0.0.3 access-list 110 permit ip any any So does this ACL 110 refers to any traffic coming from ISP 72.29.230.x to us?
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05-13-2019
09:35 AM
We try to replace our existing ASR with new ones. During the change we were unableto form BGP neighbourship with ISP. NEighbourship will get established and then withing 30 secs disconnect again logs shows Received BGP NOTIFICATION: Code = 6 (CEASE) Subcode = 1 (Maximum prefixed reached) What we are missing here
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05-13-2019
06:27 AM
when i run sh ip bgp neighbor xxxx routes i see a ll the routes from nei like Network Next Hop Metric LocPrf Weight Path * 1.0.64.0/18 72.29.x.x 0 25983 6327 2497 7 * 1.0.128.0/24 72.29.x.x 0 25983 6327 4766 3 when i run sh ip bgp neighbor xxxx received-routes i get same error message so what is difference between the two commands please ?
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05-13-2019
05:52 AM
We have EBGP neighbour with ISP. When I run below command show ip bgp neighbors 72.29.x.xpaths advertised-routes received-routes % Inbound soft reconfiguration not enabled on 72.29x.x it does not show any routes learned from the nei? does it mean that we are not learning any routes from this nei?
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05-12-2019
10:44 AM
I agree with you we will config the Router ID in BGP configuration. Then Clear ip BGP Seems in Past this Router got rebooted but still maintains this router ID. Normally when Router Reboots after a Reboot it should pick up the Router ID with highest Interface IP address. One reason can be this Router becomes neighbour with EBGP Router of the vendor before any others right?
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05-12-2019
09:07 AM
So it means rebooting the Router also does not help right? Only way is to clear BGP
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05-11-2019
11:54 AM
Below is criteria for BGP Router ID selection. Use the address configured by the bgp router-id command Use the Loopback interface address with the highest IP address Use the highest IP address of the interface. We have ASR with 4 BGP neis When i run below command show ip bgp summary BGP router identifier 72.29.230.181, local AS number BGP table version is 29157805, main routing table version 29157805 747911 network entries using 107699184 bytes of memory 1491649 path entries using 119331920 bytes of memory 232283/116550 BGP path/bestpath attribute entries using 35307016 bytes of memory 203090 BGP AS-PATH entries using 8610928 bytes of memory 1036 BGP community entries using 47028 bytes of memory 94 BGP extended community entries using 2532 bytes of memory 0 BGP route-map cache entries using 0 bytes of memory 61 BGP filter-list cache entries using 976 bytes of memory BGP using 270999584 total bytes of memory 691 received paths for inbound soft reconfiguration BGP activity 2007015/1259071 prefixes, 5564935/4073287 paths, scan interval 60 secs Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd 72.29.230.182 4 25983 7756778 75490 29157642 0 0 3w3d 745751 192.41.x.x 4 16569 4160851 6729963 29157821 0 0 3w3d 723580 199.116.233.104 4 15296 278551 75471 29157642 0 0 3w3d 17578 199.116.234.90 4 15296 102266 75476 29157642 0 0 3w3d 4046 1# show ip interface brief Interface IP-Address OK? Method Status Protocol GigabitEthernet0/0/0 72.29.230.181 YES NVRAM up up GigabitEthernet0/0/1 192.41.x.x YES NVRAM up up GigabitEthernet0/0/2 unassigned YES NVRAM up up Gi0/0/2.10 199.116.234.91 YES NVRAM up up Gi0/0/2.20 199.116.233.105 YES NVRAM up up GigabitEthernet0/0/3 198.160.191.2 YES NVRAM up up how BGP is selecting the 72.x.x.x as router identifier?
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05-11-2019
12:01 AM
We have two BGP nei one is IBGP other is EBGP to ISP below is one route show ip bgp 1.32.225.100 BGP routing table entry for 1.32.225.0/24, version 2263349 Paths: (2 available, best #2, table default) Advertised to update-groups: 3 Refresh Epoch 1 6327 1299 2914 64050>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>AS path 192.41.x.x from 192.41.x.x(64.141.118.154) Origin IGP, metric 0, localpref 100, valid, internal rx pathid: 0, tx pathid: 0 Refresh Epoch 1 25983 812 2914 64050>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>AS path 72.29.230.182 from 72.29.230.182 (72.29.224.129) Origin IGP, localpref 100, valid, external, best?????????????????????????????????????? rx pathid: 0, tx pathid: 0x0 Here we see that AS path is same 4 hops It prefers external route via 72.29.230.182 does this mean that if AS path is same then BGP will prefer route learned from EBGP over IBGP?
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| Date Registered | 03-05-2005 03:24 AM |
| Date Last Visited | 06-19-2019 12:35 AM |
| Total Messages Posted | 3,794 |
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