8
votes
Accepted
2960X Management VLAN
You can disregard the dedicated management interface and simply assign an IP address to the VLAN 500 interface on the switch and use this IP for management purpose, with appropriate access lists.
FE0 ...
- 19.8k
6
votes
Accepted
Why would Type-5 AS External OSPF Route not install in routing table?
capability vrf-lite is missing under router ospf
This article has a good explanation. Essentially, the command tells OSPF to ignore the DN bit and use the LSA in the SPF calculations.
https://...
- 76
6
votes
Accepted
CDP Native VLAN Mismatch
This happens when something downstream of the switch doesn't understand CDP and mishandles the traffic. So, something is connecting 2/0/5 to 4/0/6; chase the wiring and you'll find it. (someone has a ...
- 32.6k
5
votes
Accepted
Firmware Compatibility with 15.x IOS versions
Is there any compatibility issues with the firmware version
15.0.2-SE11 between the following devices?
There are no compatibility issues, as long as the software and basic model is identical. You ...
- 1,742
5
votes
Accepted
Use BFD on a Virtual-Template Interface
Bidirectional Forward Detection (BFD) has been deactivated on virtual and dialer interfaces on newer IOS and IOS-XE versions.
On earlier releases like IOS-XE 3S, the Cisco IOS software incorrectly
...
- 1,742
4
votes
Accepted
Defining hierarchical BGP route-maps
In larger carriers it's actually a lot more common to actually generate the route-maps (and associated peering configurations) from some kind of provisioning database via a script. The idea is that ...
- 6,152
4
votes
Accepted
Why do Cisco IOS switches send packets to DHCP servers with zero giaddr field when DHCP snooping is on?
It's not technically setting giaddr to anything. The original request had the field empty and the switch isn't changing it, because it isn't an actual dhcp-relay. The problem is the switch adding ...
- 32.6k
3
votes
Accepted
Cisco IOS: DNS Servers via DHCP
There are some options the client can request when IOS XE (and vanilla IOS, too) is a DHCP client.
I dont' have a Catalyst 9k at hand to test, but some of it might be in there, too
This is from a ...
- 8,896
3
votes
Accepted
Moving from 12.x IOS to 15.x IOS - Cisco 3750G
Converting comment to an answer.
You can upgrade from version 12.2(35)SE5 directly to the newest IOS version for the switch 3750 series found on Cisco download center.
The upgrade process will ...
- 1,742
3
votes
Why would Type-5 AS External OSPF Route not install in routing table?
The issue is right here in your database output:
Options: (No TOS-capability, DC, Downward)
At the point of redistribution the Down bit is being set as a loop prevention mechanism. By itself this ...
- 6,152
2
votes
Accepted
IOS 15.2(4)E4 pipe next command changed?
The answer is that prev and next were removed in IOS 15. The closest command they have to that functionality is the section command:
Show run all | section interface
- 51
2
votes
Accepted
C3PL working order
There are 2 different matching variations for class maps. Either match-any or match-all:
match-all = logical AND of all conditions all conditions must be true for a match
match-any = logical OR of ...
- 1,729
2
votes
Firmware Compatibility with 15.x IOS versions
You can mix POE and Non-POE SW.
The difference between POE SW is whether power is supplied or not.
You can use either of the interface power inline xxx commands. However, when the Interface is not ...
2
votes
Accepted
SNMPv3 context on IOS-XE does not seem to work with Prime
I found a fix for this. The trick is not to put the read community in the command. So we deployed this to all the IOS and IOS-XE switches and it works for all Vlans:
snmp-server group COMPANY v3 priv ...
- 1,729
2
votes
QoS Policy to not overutilize WAN link
I think you're limited by physics, more than IOS commands. When you say you're shaping the bandwidth to 80%, in reality you are buffering higher bursts and then metering them out at the desired rate. ...
- 68.1k
1
vote
Accepted
Cisco IOS - Delay DHCP offers
Just found a workaround. You can link the status of the DHCP server to a HSRP name:
interface GigabitEthernet1
ip address 172.16.220.3 255.255.255.0
standby 10 ip 172.16.220.1
standby 10 priority ...
- 1,729
1
vote
Accepted
Traffic flow of tunnel interfaces
So i did some labbing and got to the results myself. This is a schematic of a Cisco 892FSP router.
It has a built in switch, so we have to work with vlan interfaces. If we assume traffic flowing from ...
- 1,729
1
vote
Accepted
Restricting TFTP access from Host to Router using extended ACL in Cisco IOS
Your Approach 1 should work, provided it is applied to the interface towards the server (allow only host IP to use TFTP).
If you apply that ACL on the ingress interfaces, towards the clients, it ...
- 88.1k
1
vote
C3PL working order
If a packet with DSCP32 arrives to be checked against this class-map,
does it process the ACL?
This is highly implementation-specific. For example, a particular software implementation on a ...
- 2,426
Only top scored, non community-wiki answers of a minimum length are eligible