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- About JohnTylerPearce
06-13-2019
JohnTylerPearce
Member since
05-17-2009
Rising star
I currently work in Florida as a Network Engineer. I love everything about networking, I have always found it fasinating how someone in Australia can send you some data in several countries away in less than a second, and all the decisions that take place during that communication.
06-13-2017
04:56 AM
Hello,
Let's say you have specific DSCP AF values that are set for QoS classes. So, if voice if marked at DSCP EF within the ToS byte in the IPv4 Header, makes it way to the PE (within a L3 MPLS VPN environment) PE-CE Link. So, it hits the PE as an IP packet, from that point, does it automatically map the DSCP EF value to a MPLS EXP bit value? I was just curious about this. I've tried to find documentation but have had a hard time locating a document.
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Created by
JohnTylerPearce
in Network Management
in Network Management
03-02-2017
09:37 AM
03-02-2017
09:37 AM
Greetings,
I'm trying to configure an EEM script with an 'event of none', so that I can manually run the EEM script. I basically have the following script configured on a router.
event manager applet TSHOOT
event none
action 1.0 cli command "sh run | I LINK"
action 2.0 cli command "sh run | I LINE"
action 3.0 cli command "sh log | I Controller"
action 4.0 cli command "sh int x/x/x:0 | sec rate"
action 5.0 cli command "sh controller t1 x/x/x | I [1-9]"
I can go to Privileged Exec mode and type "event manager run TSHOOT", it accepts the command but nothing happens. I put the "event none", since it's not really waiting on a trigger, and so I can manually run it. Am I doing something wrong? I don't see any output at all from these commands after I run "event manager run TSHOOT".
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05-30-2014
04:50 PM
While reading Cisco documentation, router have a specific WAN speed up to 21 Mbps etc or more depending on router. You also see port speeds of 100Mbps or 1Gbps, but why are Wan speeds limited to far less on most Cisco routers.
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04-10-2014
08:51 AM
Hey guys, So, let's say I have an ISR G1 router, and a Lan-to-Lan IPSec tunnel built. On the outside interface(WAN) I have an MTU of 1260, with the 'ip mtu 1260' command. Now if I put this command in, the max IPSec (ESP) packet will be 58 bytes, and with tunnel mode you add an additional 20 bytes as well, for the new IP header, since the original or encapsulation within ESP, encrypted and authenticated. So this would come to 1338 with my math. Now if I ping from the source of my WAN to the remote IP (Extended Ping) with 1338 as the size, and DF-bit set I don't get any successful pings. If I do an Extended Ping with the byte size of 1178 which is (1100+50+20) I get successfully pings. So would it be wise to get ride of 'ip mtu 1260' and put 'ip mtu 1100' ?
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03-14-2014
12:33 PM
Amar, How long has the high cpu utilizaton been going on? Does this happen at certain times, or constantly?
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03-14-2014
12:21 PM
Plinio, I agree 100% with Jon Marshall on this one. I know what you're thinking, but in this instance, you do not need to do that. For instance, If my 2 routers have a LAN segment on /23: r1: g0/0 - 190.25.3.252/23 r2: g0/0 - 190.25.3.253/23 fw: e0/0 - 190.25.3.250/23 I can ping each other. If I put the following config, I lose the connectivity: ip route 190.25.2.0 255.255.255.0 Null0 254 ip route 190.25.3.0 255.255.255.0 Null0 254 You do not need the Null0 routes. On your picture, these LAN routes go back towards your Firewall, so as Jon Marshall suggested I would do this. ip route 190.25.2.0 255.255.255.0 [firewall-nexthop] ip route 190.25.3.0 255.255.255.0 [firewall-nexthop]
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03-12-2014
04:40 AM
Boonkeat, Sorry I didn't reply earlier, I've been pretty busy at work. The loadbalancer2.png looks good as far as getting traffic to the load balancer. Now obviosuly I don't know how this loadbalancer is suppose to receive LAN traffic, but as far as getting traffic to the load balancer it looks good in your specific situation of the load balancer only having three ports. All outgoing traffic through ISP2 should not be a problem, but you have all incoming traffic coming to ISP1. How are you doing this part? Are all your "services" on ISP1 IPs? If so then that should work perfectly fine, as long as your not statically NATng these to ISP2 this should be fine as well.
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03-11-2014
04:39 AM
Boonkeat, Are ISP1 and ISP2 different ISPs? Also, do you have public Provider Independent address space or Provider Assigned address space? What is the default route on each Firewall? I'm assuming it is probably the Load Balancer. I'm not sure how your Load Balancer works, many copies make devices like that. Do you have a brand by any chance and or model number?
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03-07-2014
12:57 PM
What happens if you do the following. no ip route-cache ip cef If it were me, and you can get away with it, I would upgrade the IOS. Also setting the 'load-interval to 30' and checking on 'show processes cpu' from time to time might be wise, to see if a micro burst is happening.
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03-07-2014
11:50 AM
Robab, Have there been any configuration changes before all the "slowness" started? Also, can you post the results of 'show processes cpu' again. You may need to change your load-interfacel from the default of 5 minutes to 'load-inteface 30' under the fast ethernet interfaces to get better idea of what's going on. Do you have any VPN tunnels on this router by any chance? Are you able to type the following command and post the rsults "show int f0/0 switching" "show int fa0/1 switching" show ip int f0/0 and show ip int f0/1
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03-07-2014
11:27 AM
Robab, If it were me, personally I would always run CEF if I can, unless you have a reason to otherwise.
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03-07-2014
08:28 AM
Robab, Well part of the poblem is obviously the CPU getting hit hard. Can you provide the output of 'show processes cpu sorted" Also, is there a reason you are using Fast Cache (ie ip route-cahce) and not CEF on these interfaces? Also, can you provide the output of 'show logging'
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06-13-2017 04:56 AM
Hello, Let's say you have specific DSCP AF values that are set for QoS
classes. So, if voice if mark...
Created by
JohnTylerPearce
in Network Management
03-02-2017 09:37 AM
03-02-2017 09:37 AM
Greetings, I'm trying to configure an EEM script with an 'event of
none', so that I can manually run...
05-30-2014 04:50 PM
While reading Cisco documentation, router have a specific WAN speed up
to 21 Mbps etc or more depend...
04-10-2014 08:51 AM
Hey guys,So, let's say I have an ISR G1 router, and a Lan-to-Lan IPSec
tunnel built. On the outside ...
03-14-2014 12:33 PM
Amar,How long has the high cpu utilizaton been going on? Does this
happen at certain times, or const...
03-14-2014 12:21 PM
Plinio, I agree 100% with Jon Marshall on this one. I know what you're
thinking, but in this instanc...
03-12-2014 04:40 AM
Boonkeat, Sorry I didn't reply earlier, I've been pretty busy at work.
The loadbalancer2.png looks g...
03-11-2014 04:39 AM
Boonkeat, Are ISP1 and ISP2 different ISPs? Also, do you have public
Provider Independent address sp...
03-07-2014 12:57 PM
What happens if you do the following.no ip route-cacheip cefIf it were
me, and you can get away with...
03-07-2014 11:50 AM
Robab,Have there been any configuration changes before all the
"slowness" started? Also, can you pos...
03-07-2014 11:27 AM
Robab,If it were me, personally I would always run CEF if I can, unless
you have a reason to otherwi...
Public Statistics
| Date Registered | 05-17-2009 07:40 AM |
| Date Last Visited | 06-13-2019 01:00 PM |
| Total Messages Posted | 1,190 |
| Total Helpful Votes Received | 377 |
Helpful Votes Given To
| User | Helpful Count |
|---|---|
| 5 | |
| 3 | |
| 4 | |
| 3 | |
| 15 |
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