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- About rakeshvelagala
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Member since
01-22-2014
235
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24
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9
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08-02-2016
07:36 PM
Hello All,
In Nexus, if we poll for ifspeed, it gives the speed configured on the interface. For example, say the interface supports both gig or 10G. How can I just extract the highest it can support though I have manually/Auto nego to a Gig? Please advise
Ethernet1/2/2 is up Dedicated Interface Hardware: 1000/10000
Thanks
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- Tags:
- #Cisco #SNMP
Labels:
04-18-2016
06:36 PM
Hi All,
Very old post but hope someone will reply.From the below DOC
http://www.cisco.com/c/en/us/support/docs/switches/catalyst-3750-series-switches/91672-catl3-wol-vlans.html
" Because of the nature of the IP addressing architecture, only the last router in the chain, the one that is connected directly to the target subnet, can conclusively identify a directed broadcast. Directed broadcasts are occasionally used for legitimate purposes, but such use is not common outside the financial services industry."
If only the last router cares if it broacast, why we need to enable the helper address on the Source where the Management server is?
Thanks for your time.
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03-13-2016
03:11 AM
Hi All,
Please advise on the below. I am just understanding the cost calculations. Consider the link between R2 and R3.
R2 has loopback 2.2.2.2 in area 0
R4 has loopback 4.4.4.4 in area 0
I have changed the cost of R4 (Eth 1/1) as 200.
From below
R2#sh ip ospf database router self-originate
Link connected to: a Stub Network (Link ID) Network/subnet number: 2.2.2.2 (Link Data) Network Mask: 255.255.255.255 Number of MTID metrics: 0 TOS 0 Metrics: 1
Link connected to: a Virtual Link (Link ID) Neighboring Router ID: 1.1.1.1 (Link Data) Router Interface address: 10.1.1.2 Number of MTID metrics: 0 TOS 0 Metrics: 10
Link connected to: a Transit Network (Link ID) Designated Router address: 172.16.1.2 (Link Data) Router Interface address: 172.16.1.2 Number of MTID metrics: 0 TOS 0 Metrics: 10
So R2 is adjacent with DR( Considering as a Virtual Process) and the cost to reach the DR is 10.
Checking what is the DR adjacent with we have,
R2#sh ip ospf database network 172.16.1.2
OSPF Router with ID (2.2.2.2) (Process ID 1)
Net Link States (Area 0)
Routing Bit Set on this LSA in topology Base with MTID 0 LS age: 776 Options: (No TOS-capability, DC) LS Type: Network Links Link State ID: 172.16.1.2 (address of Designated Router) Advertising Router: 2.2.2.2 LS Seq Number: 80000001 Checksum: 0xCB8E Length: 32 Network Mask: /24 Attached Router: 2.2.2.2 Attached Router: 4.4.4.4
So it has a router 4.4.4.4 attached to the link. So cost from 2.2.2.2 to reach the node with link identifier is cost 10 from above.
So from r2#sh ip route 4.4.4.4 (10 + 1(for r4 to loopback))=11
R2#sh ip route 4.4.4.4 Routing entry for 4.4.4.4/32 Known via "ospf 1", distance 110, metric 11, type intra area Last update from 172.16.1.4 on Ethernet1/1, 00:19:44 ago Routing Descriptor Blocks: * 172.16.1.4, from 4.4.4.4, 00:19:44 ago, via Ethernet1/1 Route metric is 11, traffic share count is 1
Now Taking from R4#
Router Link States (Area 0)
LS age: 922 Options: (No TOS-capability, DC) LS Type: Router Links Link State ID: 4.4.4.4 Advertising Router: 4.4.4.4 LS Seq Number: 80000005 Checksum: 0x8A25 Length: 60 Number of Links: 3
Link connected to: a Stub Network (Link ID) Network/subnet number: 4.4.4.4 (Link Data) Network Mask: 255.255.255.255 Number of MTID metrics: 0 TOS 0 Metrics: 1
Link connected to: a Transit Network (Link ID) Designated Router address: 192.168.1.3 (Link Data) Router Interface address: 192.168.1.4 Number of MTID metrics: 0 TOS 0 Metrics: 10
Link connected to: a Transit Network (Link ID) Designated Router address: 172.16.1.2 (Link Data) Router Interface address: 172.16.1.4 Number of MTID metrics: 0 TOS 0 Metrics: 200
R4#sh ip ospf database network 172.16.1.2
OSPF Router with ID (4.4.4.4) (Process ID 1)
Net Link States (Area 0)
Routing Bit Set on this LSA in topology Base with MTID 0 LS age: 1263 Options: (No TOS-capability, DC) LS Type: Network Links Link State ID: 172.16.1.2 (address of Designated Router) Advertising Router: 2.2.2.2 LS Seq Number: 80000001 Checksum: 0xCB8E Length: 32 Network Mask: /24 Attached Router: 2.2.2.2 Attached Router: 4.4.4.4
Now the metric is 201
R4#sh ip route 2.2.2.2 Routing entry for 2.2.2.2/32 Known via "ospf 1", distance 110, metric 201, type intra area Last update from 172.16.1.2 on Ethernet1/1, 00:25:10 ago Routing Descriptor Blocks: * 172.16.1.2, from 2.2.2.2, 00:25:10 ago, via Ethernet1/1 Route metric is 201, traffic share count is 1
Not sure if I understand correctly, but if they are adjacent to the DR, how can the cost differ? I mean if I have changed to cost on interface eth 1/1, should it not be reflected in R2#sh ip ospf database router self-originate?? Please kindly advise.
Thanks
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- Tags:
- #ospf #cost
Labels:
03-10-2016
05:57 AM
Hi
As far as I know there is a special cable to be used for Fujitsu server. Previously I heard from one of my xcolleagues got the same issue.
Thanks
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02-25-2016
01:03 AM
Hi Giuseppe,
No problem. Thanks for your reply.
To start with, I am not sure if the aggregate command has any effect. The route in the BGP table is already /24 and I am not aggregating anything. I just used the aggregate so that I can send the community value. I will check and post here if I find anything.
Thanks
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02-25-2016
12:46 AM
Hi Giuseppe,
Many thanks for your reply.
So if we use the route-map to the neighbor, then it will be advertised first to the neighbor and that neighbor will not export to others? Is my understanding right?
But if we use on the aggregate, it will not even advertise as the condition is checked first? Please advise.
Thanks
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02-24-2016
10:11 PM
Hi Masuod,
aggregate-address 153.153.153.0 255.255.255.0 attribute-map ATTR_SET
Is this not advertising to the neighbors? Please advise
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02-24-2016
09:46 PM
Hi Masoud,
https://learningnetwork.cisco.com/thread/40264
Thanks. One of the blogs, Brian Answered
If a route-map's match commands refer to an ACL or prefix list, and the ACL or prefix list matches a route with the deny action, the route is not filtered. Instead, it means the route does not match the match command logic, resulting in the Cisco IOS to consider the next route-map clause.
When using route-maps to call a ip prefix-list or ACL, the route-map decides the action (deny or permit). The prefix-list or ACL should always use "permit" clauses.
The route-map command includes an implied “deny” all clause at the end; to configure a permit all, use the route-map command with a permit action, but
without a match command.
Brian
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02-24-2016
09:38 PM
Hi Masoud,
Thanks for your reply. My confusion is since the seq 10 is matched, why it still needs to go to seq 20? Please advise.
Route maps have many features in common with widely known ACLs. These are some of the traits common to both:
• They are an ordered sequence of individual statements, each has a permit or deny result. Evaluation of ACL or route maps consists of a list scan, in a predetermined order, and an evaluation of the criteria of each statement that matches. A list scan is aborted once the first statement match is found and an action associated with the statement match is performed.
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02-24-2016
08:53 PM
Hi All,
Please advise on the below
Say I have BGP peering between A and B
R2(10.1.23.1)------(10.1.23.2)R3
Question: In seq 10 of route-map I have matched the prefix-list which matches 153.153.153.0/24 and it has to be denied. But why is it still advertised to the peer R2???
When I remove the seq 20 of the route-map, it works as intended. But shouldn't the route-map stop processing for the route 153.153.153.0/24 once it matches the seq 10?? Please advise.
R3#sh run | s router router bgp 3 bgp log-neighbor-changes network 153.153.153.0 mask 255.255.255.0 network 153.153.154.0 mask 255.255.255.0 neighbor 10.1.23.1 remote-as 65001 neighbor 10.1.23.1 route-map R3_R4_PL out
R3#sh ip prefix-list ip prefix-list R3_R4_PL: 2 entries seq 5 deny 153.153.153.0/24 seq 10 permit 153.153.154.0/24
R3#sh route-map route-map R3_R4_PL, permit, sequence 10 Match clauses: ip address prefix-lists: R3_R4_PL Set clauses: Policy routing matches: 0 packets, 0 bytes
route-map R3_R4_PL, permit, sequence 20 Match clauses: Set clauses: Policy routing matches: 0 packets, 0 bytes
on R2:
R2#sh ip bgp | b RPKI RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path *> 153.153.153.0/24 10.1.23.2 0 0 3 i *> 153.153.154.0/24 10.1.23.2 0 0 3 i
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Labels:
02-23-2016
07:52 PM
Hi All,
Just very simple config as below.
For the command " aggregate-address 153.153.153.0 255.255.255.0 attribute-map ATTR_SET", the network is loopback and is also /24. I just want to send the community "no-export" using the aggregate command. When I check the sh ip bgp for this route, the community value is not shown.
Instead of applying the ATTR_SET on the aggregate-command, if I use it on neighbor 10.1.1.1 route-map ATTR_SET, then I can see it is advertising the community value correctly. Can someone please advise what is wrong with the first way using aggregate?
r1(10.1.1.1) ----- (10.1.1.2)r2
R1#sh run | s router router bgp 1 bgp log-neighbor-changes neighbor 10.1.1.2 remote-as 2
R2#sh run | s router
router bgp 2 bgp log-neighbor-changes network 153.153.153.0 mask 255.255.255.0 aggregate-address 153.153.153.0 255.255.255.0 attribute-map ATTR_SET neighbor 10.1.1.1 remote-as 1
neighbor 10.1.1.1 send-community
R2#sh run int lo 1 Building configuration...
Current configuration : 69 bytes ! interface Loopback1 ip address 153.153.153.153 255.255.255.0
R2#sh route-map
route-map ATTR_SET, permit, sequence 10 Match clauses: Set clauses: community no-export Policy routing matches: 0 packets, 0 bytes
R1#sh ip bgp 153.153.153.0/24
BGP routing table entry for 153.153.153.0/24, version 4 Paths: (1 available, best #1, table default) Not advertised to any peer Refresh Epoch 1 2 10.1.1.2 from 10.1.1.2 (153.154.154.153) Origin IGP, metric 0, localpref 100, valid, external, best rx pathid: 0, tx pathid: 0x0
Thanks
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- Tags:
- aggregate-address
Labels:
01-19-2016
11:00 PM
Hi All,
Please advise on the below
Say for ICMP, we have enabled inspection, how the firewall does the stateful inspection?
From other blogs, it seems the ASA will create a Dynamic ACL with wildcard source address.
Question:
1)If wildcard source address, if I have crafted a packet with correct destination address and it is ICMP reply, will it be successful?
2) What are the attributes the ASA firewall will keep in its stateful session for checking of the return traffic?
Thanks
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- Tags:
- #ASA #icmp #ping
Labels:
08-02-2016
Hello All, In Nexus, if we poll for ifspeed, it gives the speed
configured on the interface. For exa...
04-18-2016
Hi All, Very old post but hope someone will reply.From the below DOC
http://www.cisco.com/c/en/us/su...
03-13-2016
Hi All, Please advise on the below. I am just understanding the cost
calculations. Consider the link...
03-10-2016
Hi As far as I know there is a special cable to be used for Fujitsu
server. Previously I heard from ...
02-25-2016
Hi Giuseppe, No problem. Thanks for your reply. To start with, I am not
sure if the aggregate comman...
02-25-2016
Hi Giuseppe, Many thanks for your reply. So if we use the route-map to
the neighbor, then it will be...
02-24-2016
Hi Masuod, aggregate-address 153.153.153.0 255.255.255.0 attribute-map
ATTR_SET Is this not advertis...
02-24-2016
Hi Masoud, https://learningnetwork.cisco.com/thread/40264 Thanks. One of
the blogs, Brian Answered I...
02-24-2016
Hi Masoud, Thanks for your reply. My confusion is since the seq 10 is
matched, why it still needs to...
02-24-2016
Hi All, Please advise on the below Say I have BGP peering between A and
B R2(10.1.23.1)------(10.1.2...
02-23-2016
Hi All, Just very simple config as below. For the command
"aggregate-address 153.153.153.0 255.255.2...
Public Statistics
| Date Registered | 01-22-2014 02:53 AM |
| Date Last Visited | 06-27-2018 12:18 AM |
| Total Messages Posted | 235 |
| Total Helpful Votes Received | 24 |
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