title: Cisco troubleshooting description: loveni chyb a zakernosti nejen na switchich Cisco published: true date: 2024-12-18T13:00:38.232Z tags: switch, troubleshooting, cisco, pre-final editor: markdown

dateCreated: 2024-11-19T06:38:09.988Z

Sériák

Moudrý muž si na zakázku kde má Cisco vždycky bere sériák

téměř každý switch hodný svého jména má sériové rozhraní
u Cisca bývá vyveden RS232 na RJ45 pinout
- připojíme se modrým kabelem a usb-serial převodníkem
některé mají rovnou usb-serial převodník v sobě
- mini usb
- usb c
po připojení vyskočí ve Správci zařízení nový COM port
připojíme se zapomocí terminálu (putty je OK)
- všechny switche by měly umět rychlost 9600 bd/s
- většina umí víc, například 115200 bd/s
dvojím stiskem enteru necháme switch provést auto detekci rychlost
- nemusí být zaplá, ale většinou je
měl by naskočit login prompt
během re/bootu switch vypisuje sám od sebe
- většinou nižší rychlostí
  
  Low level discovery
většina lepších síťových zařízení posílá na Layer 2 / MAC vrstvě packety, kterýma se identifikuje | zkratka | celé jméno | popis | | |---|---|---|---|---| | LLDP | Low level discovery protocol | spíš obecný a stručný | | CDP | Cisco Discovery protocol | preferujeme, máme ho puštěný na všech našich Cisco switchích, ale používájí ho i jiní výrobci | | MNDP | Mikrotik discovery protocol | ekvivalent výše zmíněných pro Mikrotik |

Z počítače
zobrazíme například ve Wiresharku
na obrázku vidíme
- Port ID
- číslo portu ve kterém jsme zapojení
- číslo VLAN
- jméno switche
- někdy je i popisek portu, managovací adresa switche
- ...
  
  Z Cisco switche
  
  CLI / terminál
```
show cdp neighbours
show cdp neighbours detail
show lldp neighbours
```

příklad vystupu

sg350ivanek#sho cdp nei
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
              S - Switch, H - Host, I - IGMP, r - Repeater, P - VoIP Phone
              M - Remotely-Managed Device, C - CAST Phone Port,
              W - Two-Port MAC Relay

Device ID       Local      Adv  Time To Capability   Platform     Port ID
                Interface  Ver. Live
------------------ ----------- ---- ------- ---------- ------------ -----------
c2960x-lopatov.avt    gi10      2     157      S I     cisco        GigabitEthe
g.cz                                                   WS-C2960X-48 rnet1/0/38
                                                   FPS-L

opět vidíme co je na druhé straně kabelu
Windows 11 se hlásí zapomocí LLDP, můžeme použít jako sondu

GUI / webové rozhraní
webové rozhraní nechávám sedět jen na https
webové rozhraní se mění, terminál zůstává stále stejný

Zálohy konfigurací

všechny switche co projdou IT mají někde zálohovanou konfiguraci
- včetně data kdy byla pořízena
je to užitečně nejen pro případ obnovy, ale i pro rychlé zorientování
v zakázkách to bývá pod realizace a IT
nejčastější problém je domnělý versus skutečný stav nastavení portů
zjistíme snadno

Komentované výňatky ze zálohy konfigurace Cisco Switche
```
config-file-header
cabin-data3
v3.4.0.17 / RCBS3.4_950_377_325
```

kus vypuštěn

interface vlan 50
name 50control 
ip address 192.168.50.9 255.255.255.0 
ip igmp version 2

nastavení VLAN

včetně slovního popisu name

interface GigabitEthernet13
description 55dante
switchport access vlan 55 
!

nastavení jednotlivých portů
takto vypadá access port
- "platí" to co je na řádku 24
- switchport access vlan CISLOVLAN
- to co je v description je slovní popis, nemusí "platit", když se stane chyba konfigurace
```
interface GigabitEthernet25
description trunk
switchport mode trunk 
```
ukázka trunkovacího portu

Spanning tree / smyčky
switche se živí, tím že posílají dál packety co jim přijdou
když si s packetem neví rady, tak ho pošlo "všude" (metafora)
pokud se zapojí "všude" do "vstupu" vznikne hrnečku vař
dřív to běžně shodilo celou síť, nyní máme technologie které tomu mají zabránít
- Spanning tree
- L2 loop protection
- ...
žádná technologie není všespásná
- čím složitější, tím větší prostor pro chybu konfigurace
- nebo bugy
i dneska lze udělat smyčku, ani se nemusíme moc snažit
ve chvíli kdy jsou switche ve smyčce nejde typicky nicmoc vyřešit vzdáleně

Jak poznáme smyčku
síť má výrazně snížený výkon nebo výpadky
přijde nám "divné" DHCP z jiné VLAN
většinou se to projeví dost rychle

Jak naložit se smyčkou

Rychlý způsob
protože se smyčka projeví většinou rychle, stačí se zamyslet na posledními změnami
postupně je vrátit zpátky
smyčka by měla zmizet

Pomalý způsob
rozděl a panuj
vypneme / rozpojíme celou síť
- postupně přidáváme
- tam kde naskočí potíž můžeme jet jednotlivé porty
- odpojíme problematickou část
  
  PoE
aktivní PoE se první musí vyjednat po LLDP
ne všichni klienti rozumí všem switchům
někdy zařízení při startu berou příliš velký proud
- cisco typicky dává 450 mA
někdy Cisco vezme zařízení připojované postupně, ale při re/bootu, když naběhnou všechny najednou tak to nedá a zhodí celý PoE

Diagnostika
z terminálu
```
show power inline
```

ukázka výstupu

Power-limit mode: Class based
Usage threshold: 95%
Trap: Disable
Legacy Mode: Enable
Inrush Test: Enable
Guard-Band Value: Static (2W)

Unit Module           Nominal   Allocated    Temp     SW            PSE chipset
                  Power (W) Power (W)    (C)      Version       HW Revision
---- ---------------- --------- ------------ -------- ------------- -----------------
1    CBS350-48P-4X    370       75 (20%)     41       0.2.0.34       TPS2388 - 0x40C4
                                                                 TPS2388 - 0x40C4
                                                                 TPS2388 - 0x40C4
                                                                 TPS2388 - 0x40C4
                                                                 TPS2388 - 0x40C4
                                                                 TPS2388 - 0x40C4


Interface    Admin       Oper         Power (W)     Class     Device     Priority
---------- ---------- ----------- ----------------- ----- -------------- --------
gi1/0/1    Never      Off         0.0               -                    low
gi1/0/2    Auto       Searching   0.0               -                    low
gi1/0/3    Never      Off         0.0               -                    low
gi1/0/4    Never      Off         0.0               -                    low
gi1/0/5    Auto       On          1.81              0                    low
gi1/0/6    Never      Off         0.0               -                    low
...
gi1/0/10   Auto       Fault       0.0               -                    low
...

případne detail rozhraní (gi1/0/10 je jméno rozhraní, stačí zkopírovat z předchozího kroku)
```
show power inline gi1/0/10
```

ukázka výstupu


Interface    Admin       Oper         Power (W)     Class     Device     Priority
---------- ---------- ----------- ----------------- ----- -------------- --------
gi1/0/10   Auto       Fault       0.0               -                    low


Port Status:               Port is off. Short condition
Port standard:             802.3AT
Admin power limit (for port power-limit mode): 30.0 watts
Time range:
Operational power limit:   30.0 watts
Negotiated power:          0.0 watts (None)
Current (mA):              0
Voltage(V):                0.0
Overload Counter:          0
Short Counter:             4597812
Denied Counter:            0
Absent Counter:            9
Invalid Signature Counter: 0

s tímhle portem je mrzení
- je ve zkratu co se týče PoE
- je vypnutý co se týče PoE
  
  Rešení
rozděl a panuj
- najít nekompatabilní zařízení a přehodit na injektor
zkusit očistit porty po celé trase, jestli se nekde opravdu neděje zkrat

injektor má nevýhody

další krabička
zařízení se pak nedá na dálku resetovat

není vidět jestli a kolik bere proudu

ukázka komplet low level discovery výstupu

Ukázky z různých zařízení

Link Layer Discovery Protocol Chassis Subtype = Locally assigned, Id: cbs350-it-test 0000 001. .... .... = TLV Type: Chassis Id (1) .... ...0 0000 1111 = TLV Length: 15 Chassis Id Subtype: Locally assigned (7) Chassis Id: 6362733335 Port Subtype = MAC address, Id: a0:0f:37:2b:ca:f9 0000 010. .... .... = TLV Type: Port Id (2) .... ...0 0000 0111 = TLV Length: 7 Port Id Subtype: MAC address (3) Port Id: Cisco_2b:ca:f9 (a0:0f:37:2b:ca:f9) Time To Live = 120 sec [Normal LLDPDU] 0000 011. .... .... = TLV Type: Time to Live (3) .... ...0 0000 0010 = TLV Length: 2 Seconds: 120 Telecommunications Industry Association TR-41 Committee - Media Capabilities 1111 111. .... .... = TLV Type: Organization Specific (127) .... ...0 0000 0111 = TLV Length: 7 Organization Unique Code: 00:12:bb (Telecommunications Industry Association TR-41 Committee) Media Subtype: Media Capabilities (0x01) Capabilities: 0x002f

.... .... .... ...1 = LLDP-MED Capabilities: Capable
.... .... .... ..1. = Network Policy: Capable
.... .... .... .1.. = Location Identification: Capable
.... .... .... 1... = Extended Power via MDI-PSE: Capable
.... .... ...0 .... = Extended Power via MDI-PD: Not capable
.... .... ..1. .... = Inventory: Capable

Class Type: Network Connectivity (4) Ieee 802.3 - MAC/PHY Configuration/Status 1111 111. .... .... = TLV Type: Organization Specific (127) .... ...0 0000 1001 = TLV Length: 9 Organization Unique Code: 00:12:0f (Ieee 802.3) IEEE 802.3 Subtype: MAC/PHY Configuration/Status (0x01) Auto-Negotiation Support/Status: 0x03

.... ...1 = Auto-Negotiation: Supported
.... ..1. = Auto-Negotiation: Enabled

PMD Auto-Negotiation Advertised Capability: 0x6c01

.... .... .... ...1 = 1000BASE-T (full duplex mode): Capable
.... .... .... ..0. = 1000BASE-T (half duplex mode): Not capable
.... .... .... .0.. = 1000BASE-X (-LX, -SX, -CX full duplex mode): Not capable
.... .... .... 0... = 1000BASE-X (-LX, -SX, -CX half duplex mode): Not capable
.... .... ...0 .... = Asymmetric and Symmetric PAUSE (for full-duplex links): Not capable
.... .... ..0. .... = Symmetric PAUSE (for full-duplex links): Not capable
.... .... .0.. .... = Asymmetric PAUSE (for full-duplex links): Not capable
.... .... 0... .... = PAUSE (for full-duplex links): Not capable
.... ...0 .... .... = 100BASE-T2 (full duplex mode): Not capable
.... ..0. .... .... = 100BASE-T2 (half duplex mode): Not capable
.... .1.. .... .... = 100BASE-TX (full duplex mode): Capable
.... 1... .... .... = 100BASE-TX (half duplex mode): Capable
...0 .... .... .... = 100BASE-T4: Not capable
..1. .... .... .... = 10BASE-T (full duplex mode): Capable
.1.. .... .... .... = 10BASE-T (half duplex mode): Capable
0... .... .... .... = Other or unknown: Not capable

Same in inverse (wrong) bitorder

0... .... .... .... = 1000BASE-T (full duplex mode): Not capable
.1.. .... .... .... = 1000BASE-T (half duplex mode): Capable
..1. .... .... .... = 1000BASE-X (-LX, -SX, -CX full duplex mode): Capable
...0 .... .... .... = 1000BASE-X (-LX, -SX, -CX half duplex mode): Not capable
.... 1... .... .... = Asymmetric and Symmetric PAUSE (for full-duplex links): Capable
.... .1.. .... .... = Symmetric PAUSE (for full-duplex links): Capable
.... ..0. .... .... = Asymmetric PAUSE (for full-duplex links): Not capable
.... ...0 .... .... = PAUSE (for full-duplex links): Not capable
.... .... 0... .... = 100BASE-T2 (full duplex mode): Not capable
.... .... .0.. .... = 100BASE-T2 (half duplex mode): Not capable
.... .... ..0. .... = 100BASE-TX (full duplex mode): Not capable
.... .... ...0 .... = 100BASE-TX (half duplex mode): Not capable
.... .... .... 0... = 100BASE-T4: Not capable
.... .... .... .0.. = 10BASE-T (full duplex mode): Not capable
.... .... .... ..0. = 10BASE-T (half duplex mode): Not capable
.... .... .... ...1 = Other or unknown: Capable

Operational MAU Type: 1000BaseTFD - Four-pair Category 5 UTP, full duplex mode (0x001e) System Name = cbs350-it-test 0000 101. .... .... = TLV Type: System Name (5) .... ...0 0000 1110 = TLV Length: 14 System Name: cbs350-it-test Capabilities 0000 111. .... .... = TLV Type: System Capabilities (7) .... ...0 0000 0100 = TLV Length: 4 Capabilities: 0x0004

.... .... .... ...0 = Other: Not capable
.... .... .... ..0. = Repeater: Not capable
.... .... .... .1.. = Bridge: Capable
.... .... .... 0... = WLAN access point: Not capable
.... .... ...0 .... = Router: Not capable
.... .... ..0. .... = Telephone: Not capable
.... .... .0.. .... = DOCSIS cable device: Not capable
.... .... 0... .... = Station only: Not capable
.... ...0 .... .... = C-VLAN component: Not capable
.... ..0. .... .... = S-VLAN component: Not capable
.... .0.. .... .... = TPMR component: Not capable

Enabled Capabilities: 0x0004

.... .... .... ...0 = Other: Not capable
.... .... .... ..0. = Repeater: Not capable
.... .... .... .1.. = Bridge: Capable
.... .... .... 0... = WLAN access point: Not capable
.... .... ...0 .... = Router: Not capable
.... .... ..0. .... = Telephone: Not capable
.... .... .0.. .... = DOCSIS cable device: Not capable
.... .... 0... .... = Station only: Not capable
.... ...0 .... .... = C-VLAN component: Not capable
.... ..0. .... .... = S-VLAN component: Not capable
.... .0.. .... .... = TPMR component: Not capable

Management Address 0001 000. .... .... = TLV Type: Management Address (8) .... ...0 0000 1100 = TLV Length: 12 Address String Length: 5 Address Subtype: IPv4 (1) Management Address: 10.1.10.174 Interface Subtype: ifIndex (2) Interface Number: 100009 OID String Length: 0 IEEE 802.1 Chair - Port VLAN ID 1111 111. .... .... = TLV Type: Organization Specific (127) .... ...0 0000 0110 = TLV Length: 6 Organization Unique Code: 00:80:c2 (IEEE 802.1 Chair) IEEE 802.1 Subtype: Port VLAN ID (0x01) Port VLAN Identifier: 10 (0x000a) End of LLDPDU 0000 000. .... .... = TLV Type: End of LLDPDU (0) .... ...0 0000 0000 = TLV Length: 0

Cisco Discovery Protocol

Version: 2
TTL: 180 seconds
Checksum: 0x3b56 [correct]
[Checksum Status: Good]
Device ID: cbs350-it-test
    Type: Device ID (0x0001)
    Length: 18
    Device ID: cbs350-it-test
Addresses
    Type: Addresses (0x0002)
    Length: 17
    Number of addresses: 1
    IP address: 10.1.10.174
        Protocol type: NLPID (0x01)
        Protocol length: 1
        Protocol: IP
        Address length: 4
        IP Address: 10.1.10.174
Port ID: gi7
    Type: Port ID (0x0003)
    Length: 7
    Sent through Interface: gi7
Capabilities
    Type: Capabilities (0x0004)
    Length: 8
    Capabilities: 0x00000029
        .... .... .... .... .... .... .... ...1 = Router: Yes
        .... .... .... .... .... .... .... ..0. = Transparent Bridge: No
        .... .... .... .... .... .... .... .0.. = Source Route Bridge: No
        .... .... .... .... .... .... .... 1... = Switch: Yes
        .... .... .... .... .... .... ...0 .... = Host: No
        .... .... .... .... .... .... ..1. .... = IGMP capable: Yes
        .... .... .... .... .... .... .0.. .... = Repeater: No
        .... .... .... .... .... .... 0... .... = VoIP Phone: No
        .... .... .... .... .... ...0 .... .... = Remotely Managed Device: No
        .... .... .... .... .... ..0. .... .... = CVTA/STP Dispute Resolution/Cisco VT Camera: No
        .... .... .... .... .... .0.. .... .... = Two Port Mac Relay: No
Software Version
    Type: Software version (0x0005)
    Length: 12
    Software version: 3.4.0.17
Platform: Cisco CBS350-8P-E-2G (PID:CBS350-8P-E-2G)-VSD
    Type: Platform (0x0006)
    Length: 49
    Platform: Cisco CBS350-8P-E-2G (PID:CBS350-8P-E-2G)-VSD
Native VLAN: 10
    Type: Native VLAN (0x000a)
    Length: 6
    Native VLAN: 10
Duplex: Full
    Type: Duplex (0x000b)
    Length: 5
    Duplex: Full
Trust Bitmap: 0x00
    Type: Trust Bitmap (0x0012)
    Length: 5
    Trust Bitmap: 0x00
Untrusted port CoS: 0x00
    Type: Untrusted Port CoS (0x0013)
    Length: 5
    Untrusted port CoS: 0x00
System Name: cbs350-it-test
    Type: System Name (0x0014)
    Length: 18
    System Name: cbs350-it-test
Power Available: 30000 mW, 4294967295 mW
    Type: Power Available (0x001a)
    Length: 16
    Request-ID: 0
    Management-ID: 956
    Power Available: 30000mW
    Power Available: 4294967295mW

Mikrotik Neighbor Discovery Protocol

Header Unknown: 7cef
SeqNo: 0
T 1, L 6: MAC-Address
    TlvType: 1 = MAC-Address
    TlvLength: 6
    MAC-Address: VMware_55:13:39 (00:0c:29:55:13:39)
T 5, L 10: Identity
    TlvType: 5 = Identity
    TlvLength: 10
    Identity: chr-opatov
T 7, L 35: Version
    TlvType: 7 = Version
    TlvLength: 35
    Version: 7.16.1 (stable) 2024-10-10 14:03:32
T 8, L 8: Platform
    TlvType: 8 = Platform
    TlvLength: 8
    Platform: MikroTik
T 10, L 4: Uptime
    TlvType: 10 = Uptime
    TlvLength: 4
    Uptime: 1832996.000000000 seconds
T 11, L 11: Software-ID
    TlvType: 11 = Software-ID
    TlvLength: 11
    Software-ID: Dr+43uz+oDE
T 12, L 3: Board
    TlvType: 12 = Board
    TlvLength: 3
    Board: CHR
T 14, L 1: Unpack
    TlvType: 14 = Unpack
    TlvLength: 1
    Unpack: None (1)
T 15, L 16: IPv6-Address
    TlvType: 15 = IPv6-Address
    TlvLength: 16
    IPv6-Address: fe80::20c:29ff:fe55:1339
T 16, L 10: Interface name
    TlvType: 16 = Interface name
    TlvLength: 10
    Interface name: 10pocitaky
T 17, L 4: IPv4-Address
    TlvType: 17 = IPv4-Address
    TlvLength: 4
    IPv4-Address: 10.1.10.1

Link Layer Discovery Protocol

Chassis Subtype = MAC address, Id: 94:18:65:77:33:44
    0000 001. .... .... = TLV Type: Chassis Id (1)
    .... ...0 0000 0111 = TLV Length: 7
    Chassis Id Subtype: MAC address (4)
    Chassis Id: Netgear_77:33:44 (94:18:65:77:33:44)
Port Subtype = Interface name, Id: 0/7
    0000 010. .... .... = TLV Type: Port Id (2)
    .... ...0 0000 0100 = TLV Length: 4
    Port Id Subtype: Interface name (5)
    Port Id: 0/7
Time To Live = 120 sec
    [Normal LLDPDU]
    0000 011. .... .... = TLV Type: Time to Live (3)
    .... ...0 0000 0010 = TLV Length: 2
    Seconds: 120
Port Description = 0/7
    0000 100. .... .... = TLV Type: Port Description (4)
    .... ...0 0000 0011 = TLV Length: 3
    Port Description: 0/7
System Name = m4250-8g2xf-test
    0000 101. .... .... = TLV Type: System Name (5)
    .... ...0 0001 0000 = TLV Length: 16
    System Name: m4250-8g2xf-test
System Description = M4250-8G2XF-PoE+ 8x1G PoE+ 220W and 2xSFP+ Managed Switch, 13.0.4.26, 1.0.0.11
    0000 110. .... .... = TLV Type: System Description (6)
    .... ...0 0100 1110 = TLV Length: 78
    System Description: M4250-8G2XF-PoE+ 8x1G PoE+ 220W and 2xSFP+ Managed Switch, 13.0.4.26, 1.0.0.11
Capabilities
    0000 111. .... .... = TLV Type: System Capabilities (7)
    .... ...0 0000 0100 = TLV Length: 4
    Capabilities: 0x0014
        .... .... .... ...0 = Other: Not capable
        .... .... .... ..0. = Repeater: Not capable
        .... .... .... .1.. = Bridge: Capable
        .... .... .... 0... = WLAN access point: Not capable
        .... .... ...1 .... = Router: Capable
        .... .... ..0. .... = Telephone: Not capable
        .... .... .0.. .... = DOCSIS cable device: Not capable
        .... .... 0... .... = Station only: Not capable
        .... ...0 .... .... = C-VLAN component: Not capable
        .... ..0. .... .... = S-VLAN component: Not capable
        .... .0.. .... .... = TPMR component: Not capable
    Enabled Capabilities: 0x0014
        .... .... .... ...0 = Other: Not capable
        .... .... .... ..0. = Repeater: Not capable
        .... .... .... .1.. = Bridge: Capable
        .... .... .... 0... = WLAN access point: Not capable
        .... .... ...1 .... = Router: Capable
        .... .... ..0. .... = Telephone: Not capable
        .... .... .0.. .... = DOCSIS cable device: Not capable
        .... .... 0... .... = Station only: Not capable
        .... ...0 .... .... = C-VLAN component: Not capable
        .... ..0. .... .... = S-VLAN component: Not capable
        .... .0.. .... .... = TPMR component: Not capable
IEEE 802.1 Chair - Port VLAN ID
    1111 111. .... .... = TLV Type: Organization Specific (127)
    .... ...0 0000 0110 = TLV Length: 6
    Organization Unique Code: 00:80:c2 (IEEE 802.1 Chair)
    IEEE 802.1 Subtype: Port VLAN ID (0x01)
    Port VLAN Identifier: 2 (0x0002)
Management Address
    0001 000. .... .... = TLV Type: Management Address (8)
    .... ...0 0010 0110 = TLV Length: 38
    Address String Length: 5
    Address Subtype: IPv4 (1)
    Management Address: 10.1.1.110
    Interface Subtype: ifIndex (2)
    Interface Number: 17
    OID String Length: 26
    Object Identifier: 1.9.46.51.46.54.46.49.46.52.46.49.46.52.53.50.54.46.49.48.48.46.49.49.46.52.48 (iso.9.46.51.46.54.46.49.46.52.46.49.46.52.53.50.54.46.49.48.48.46.49.49.46.52.48)
Ieee 802.3 - Power Via MDI
    1111 111. .... .... = TLV Type: Organization Specific (127)
    .... ...0 0000 1100 = TLV Length: 12
    Organization Unique Code: 00:12:0f (Ieee 802.3)
    IEEE 802.3 Subtype: Power Via MDI (0x02)
    MDI Power Support: 0x0f
        .... ...1 = Port Class: PSE
        .... ..1. = PSE MDI Power: Supported
        .... .1.. = PSE MDI Power: Enabled
        .... 1... = PSE Pairs Control Ability: Yes
    PSE Power Pair: Signal (1)
    Power Class: Unknown (0)
    00.. .... = Power Type: Type 2 PSE Device (0)
    ..01 .... = Power Source: 1 Primary Power Source
    .... .0.. = PD 4PID: Not supported
    .... ..11 = Power Priority: Low (3)
    PD Requested Power Value: 0.0. Watt
    PSE Allocated Power Value: 0.0. Watt
Ieee 802.3 - Link Aggregation
    1111 111. .... .... = TLV Type: Organization Specific (127)
    .... ...0 0000 1001 = TLV Length: 9
    Organization Unique Code: 00:12:0f (Ieee 802.3)
    IEEE 802.3 Subtype: Link Aggregation (0x03)
        [Expert Info (Warning/Protocol): TLV has been deprecated]
            [TLV has been deprecated]
            [Severity level: Warning]
            [Group: Protocol]
    Aggregation Status: 0x01
        .... ...1 = Aggregation Capability: Yes
        .... ..0. = Aggregation Status: Disabled
    Aggregated Port Id: 0
Ieee 802.3 - Maximum Frame Size
    1111 111. .... .... = TLV Type: Organization Specific (127)
    .... ...0 0000 0110 = TLV Length: 6
    Organization Unique Code: 00:12:0f (Ieee 802.3)
    IEEE 802.3 Subtype: Maximum Frame Size (0x04)
    Maximum Frame Size: 9216
Ieee 802.3 - MAC/PHY Configuration/Status
    1111 111. .... .... = TLV Type: Organization Specific (127)
    .... ...0 0000 1001 = TLV Length: 9
    Organization Unique Code: 00:12:0f (Ieee 802.3)
    IEEE 802.3 Subtype: MAC/PHY Configuration/Status (0x01)
    Auto-Negotiation Support/Status: 0x03
        .... ...1 = Auto-Negotiation: Supported
        .... ..1. = Auto-Negotiation: Enabled
    PMD Auto-Negotiation Advertised Capability: 0x6c03
        .... .... .... ...1 = 1000BASE-T (full duplex mode): Capable
        .... .... .... ..1. = 1000BASE-T (half duplex mode): Capable
        .... .... .... .0.. = 1000BASE-X (-LX, -SX, -CX full duplex mode): Not capable
        .... .... .... 0... = 1000BASE-X (-LX, -SX, -CX half duplex mode): Not capable
        .... .... ...0 .... = Asymmetric and Symmetric PAUSE (for full-duplex links): Not capable
        .... .... ..0. .... = Symmetric PAUSE (for full-duplex links): Not capable
        .... .... .0.. .... = Asymmetric PAUSE (for full-duplex links): Not capable
        .... .... 0... .... = PAUSE (for full-duplex links): Not capable
        .... ...0 .... .... = 100BASE-T2 (full duplex mode): Not capable
        .... ..0. .... .... = 100BASE-T2 (half duplex mode): Not capable
        .... .1.. .... .... = 100BASE-TX (full duplex mode): Capable
        .... 1... .... .... = 100BASE-TX (half duplex mode): Capable
        ...0 .... .... .... = 100BASE-T4: Not capable
        ..1. .... .... .... = 10BASE-T (full duplex mode): Capable
        .1.. .... .... .... = 10BASE-T (half duplex mode): Capable
        0... .... .... .... = Other or unknown: Not capable
    Same in inverse (wrong) bitorder
        0... .... .... .... = 1000BASE-T (full duplex mode): Not capable
        .1.. .... .... .... = 1000BASE-T (half duplex mode): Capable
        ..1. .... .... .... = 1000BASE-X (-LX, -SX, -CX full duplex mode): Capable
        ...0 .... .... .... = 1000BASE-X (-LX, -SX, -CX half duplex mode): Not capable
        .... 1... .... .... = Asymmetric and Symmetric PAUSE (for full-duplex links): Capable
        .... .1.. .... .... = Symmetric PAUSE (for full-duplex links): Capable
        .... ..0. .... .... = Asymmetric PAUSE (for full-duplex links): Not capable
        .... ...0 .... .... = PAUSE (for full-duplex links): Not capable
        .... .... 0... .... = 100BASE-T2 (full duplex mode): Not capable
        .... .... .0.. .... = 100BASE-T2 (half duplex mode): Not capable
        .... .... ..0. .... = 100BASE-TX (full duplex mode): Not capable
        .... .... ...0 .... = 100BASE-TX (half duplex mode): Not capable
        .... .... .... 0... = 100BASE-T4: Not capable
        .... .... .... .0.. = 10BASE-T (full duplex mode): Not capable
        .... .... .... ..1. = 10BASE-T (half duplex mode): Capable
        .... .... .... ...1 = Other or unknown: Capable
    Operational MAU Type: 1000BaseTFD - Four-pair Category 5 UTP, full duplex mode (0x001e)
Telecommunications Industry Association TR-41 Committee - Media Capabilities
    1111 111. .... .... = TLV Type: Organization Specific (127)
    .... ...0 0000 0111 = TLV Length: 7
    Organization Unique Code: 00:12:bb (Telecommunications Industry Association TR-41 Committee)
    Media Subtype: Media Capabilities (0x01)
    Capabilities: 0x002f
        .... .... .... ...1 = LLDP-MED Capabilities: Capable
        .... .... .... ..1. = Network Policy: Capable
        .... .... .... .1.. = Location Identification: Capable
        .... .... .... 1... = Extended Power via MDI-PSE: Capable
        .... .... ...0 .... = Extended Power via MDI-PD: Not capable
        .... .... ..1. .... = Inventory: Capable
    Class Type: Network Connectivity (4)
Netgear - Unknown (101)
    1111 111. .... .... = TLV Type: Organization Specific (127)
    .... ...0 0000 1100 = TLV Length: 12
    Organization Unique Code: 8c:3b:ad (Netgear)
    Unknown Subtype: 101
    Unknown Subtype Content: 0000000300000003
IEEE 802.1 Chair - VLAN Name
    1111 111. .... .... = TLV Type: Organization Specific (127)
    .... ...0 0000 1111 = TLV Length: 15
    Organization Unique Code: 00:80:c2 (IEEE 802.1 Chair)
    IEEE 802.1 Subtype: VLAN Name (0x03)
    VLAN Identifier: 2 (0x0002)
    VLAN Name Length: 8
    VLAN Name: VLAN0002
End of LLDPDU
    0000 000. .... .... = TLV Type: End of LLDPDU (0)
    .... ...0 0000 0000 = TLV Length: 0

Cisco Discovery Protocol

Version: 2
TTL: 180 seconds
Checksum: 0x4235 [correct]
[Checksum Status: Good]
Device ID: 6YX32953A00C8
    Type: Device ID (0x0001)
    Length: 17
    Device ID: 6YX32953A00C8
Platform: M4250-8G2XF-PoE+
    Type: Platform (0x0006)
    Length: 20
    Platform: M4250-8G2XF-PoE+
Capabilities
    Type: Capabilities (0x0004)
    Length: 8
    Capabilities: 0x00000001
        .... .... .... .... .... .... .... ...1 = Router: Yes
        .... .... .... .... .... .... .... ..0. = Transparent Bridge: No
        .... .... .... .... .... .... .... .0.. = Source Route Bridge: No
        .... .... .... .... .... .... .... 0... = Switch: No
        .... .... .... .... .... .... ...0 .... = Host: No
        .... .... .... .... .... .... ..0. .... = IGMP capable: No
        .... .... .... .... .... .... .0.. .... = Repeater: No
        .... .... .... .... .... .... 0... .... = VoIP Phone: No
        .... .... .... .... .... ...0 .... .... = Remotely Managed Device: No
        .... .... .... .... .... ..0. .... .... = CVTA/STP Dispute Resolution/Cisco VT Camera: No
        .... .... .... .... .... .0.. .... .... = Two Port Mac Relay: No
Software Version
    Type: Software version (0x0005)
    Length: 13
    Software version: 13.0.4.26
Addresses
    Type: Addresses (0x0002)
    Length: 26
    Number of addresses: 2
    IP address: 10.1.10.196
        Protocol type: NLPID (0x01)
        Protocol length: 1
        Protocol: IP
        Address length: 4
        IP Address: 10.1.10.196
    IP address: 10.1.1.110
        Protocol type: NLPID (0x01)
        Protocol length: 1
        Protocol: IP
        Address length: 4
        IP Address: 10.1.1.110
Port ID: 0/7
    Type: Port ID (0x0003)
    Length: 7
    Sent through Interface: 0/7
Native VLAN: 2
    Type: Native VLAN (0x000a)
    Length: 6
    Native VLAN: 2

Cisco-troubleshooting.md 31 KB 히스토리 Raw

dateCreated: 2024-11-19T06:38:09.988Z

Sériák

Moudrý muž si na zakázku kde má Cisco vždycky bere sériák

Low level discovery

Z počítače

Z Cisco switche

CLI / terminál

GUI / webové rozhraní

Zálohy konfigurací

Komentované výňatky ze zálohy konfigurace Cisco Switche

Spanning tree / smyčky

Jak poznáme smyčku

Jak naložit se smyčkou

Rychlý způsob

Pomalý způsob

PoE

Diagnostika

Rešení

ukázka komplet low level discovery výstupu

Cisco-troubleshooting.md 31 KB

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